Quantity Limit Detail - Definitions - DaVinci Payer Data Exchange (PDex) US Drug Formulary v2.0.1

DaVinci Payer Data Exchange (PDex) US Drug Formulary, published by HL7 International / Pharmacy. This guide is not an authorized publication; it is the continuous build for version 2.0.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/davinci-pdex-formulary/ and changes regularly. See the Directory of published versions

Extension: QuantityLimitDetail - Detailed Descriptions

Page standards status: Trial-use

Definitions for the usdf-QuantityLimitDetail-extension extension.

Differential Elements Table
Key Elements Table
Snapshot Elements Table

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition	A detailed definition of the quantity limits the coverage plan imposes on this drug. These limit details may include (potentially including a rolling dispense limit, maximum daily, or therapy days for a period of time. (Only include if QuantityLimit = true)
Short	Quantity Limit Detail
2. Extension.extension
Control	1..?
4. Extension.extension:Description
Slice Name	Description
Short	A human readable description of quantity limits.
Control	0..1
6. Extension.extension:Description.extension
Control	0..0
8. Extension.extension:Description.url
Fixed Value	Description
10. Extension.extension:Description.value[x]
Control	1..?
Type	string
[x] Note	See Choice of Data Types for further information about how to use [x]
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
12. Extension.extension:Rolling
Slice Name	Rolling
Short	Indicator of dispense amount limit per time period.
Control	0..1
14. Extension.extension:Rolling.extension
Control	0..0
16. Extension.extension:Rolling.url
Fixed Value	Rolling
18. Extension.extension:Rolling.value[x]
Control	1..?
Type	Timing
[x] Note	See Choice of Data Types for further information about how to use [x]
20. Extension.extension:Rolling.value[x].event
Control	0..0
22. Extension.extension:Rolling.value[x].repeat
Control	1..?
24. Extension.extension:Rolling.value[x].repeat.count
Control	1..?
26. Extension.extension:Rolling.value[x].repeat.period
Control	1..?
28. Extension.extension:Rolling.value[x].repeat.periodUnit
Pattern Value	d
30. Extension.extension:MaximumDaily
Slice Name	MaximumDaily
Short	Indicator of maximum daily amount.
Control	0..1
32. Extension.extension:MaximumDaily.extension
Control	0..0
34. Extension.extension:MaximumDaily.url
Fixed Value	MaximumDaily
36. Extension.extension:MaximumDaily.value[x]
Control	1..?
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
38. Extension.extension:MaximumDaily.value[x].value
Control	1..?
40. Extension.extension:DaysSupply
Slice Name	DaysSupply
Short	Indicator of number of therapy days over time period.
Control	0..1
42. Extension.extension:DaysSupply.extension
Control	0..0
44. Extension.extension:DaysSupply.url
Fixed Value	DaysSupply
46. Extension.extension:DaysSupply.value[x]
Control	1..?
Type	Timing
[x] Note	See Choice of Data Types for further information about how to use [x]
48. Extension.extension:DaysSupply.value[x].event
Control	0..0
50. Extension.extension:DaysSupply.value[x].repeat
Control	1..?
52. Extension.extension:DaysSupply.value[x].repeat.bounds[x]
Control	1..?
Type	Duration
[x] Note	See Choice of Data Types for further information about how to use [x]
54. Extension.extension:DaysSupply.value[x].repeat.bounds[x].value
Control	1..?
56. Extension.extension:DaysSupply.value[x].repeat.bounds[x].system
Pattern Value	http://unitsofmeasure.org
58. Extension.extension:DaysSupply.value[x].repeat.bounds[x].code
Pattern Value	d
60. Extension.extension:DaysSupply.value[x].repeat.count
Control	1..?
62. Extension.extension:DaysSupply.value[x].repeat.period
Control	1..?
64. Extension.extension:DaysSupply.value[x].repeat.periodUnit
Pattern Value	d
66. Extension.url
Fixed Value	http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-QuantityLimitDetail-extension
68. Extension.value[x]
Control	0..0

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition	A detailed definition of the quantity limits the coverage plan imposes on this drug. These limit details may include (potentially including a rolling dispense limit, maximum daily, or therapy days for a period of time. (Only include if QuantityLimit = true) Optional Extension Element - found in all resources.
Short	Quantity Limit DetailOptional Extensions Element
Control	0..* This element is affected by the following invariants: ele-1
Is Modifier	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	10..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
4. Extension.extension:Description
Slice Name	Description
Definition	An Extension
Short	A human readable description of quantity limits.Additional content defined by implementations
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
6. Extension.extension:Description.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..0*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
8. Extension.extension:Description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	Description
10. Extension.extension:Description.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Type	string, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
12. Extension.extension:Rolling
Slice Name	Rolling
Definition	An Extension
Short	Indicator of dispense amount limit per time period.Additional content defined by implementations
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
14. Extension.extension:Rolling.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..0*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
16. Extension.extension:Rolling.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	Rolling
18. Extension.extension:Rolling.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Type	Timing, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
20. Extension.extension:Rolling.value[x].modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Short	Extensions that cannot be ignored even if unrecognized
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
Summary	true
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Alternate Names	extensions, user content, modifiers
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
22. Extension.extension:Rolling.value[x].event
Definition	Identifies specific times when the event occurs.
Short	When the event occurs
Control	0..0*
Type	dateTime
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	In a Medication Administration Record, for instance, you need to take a general specification, and turn it into a precise specification.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
24. Extension.extension:Rolling.value[x].repeat
Definition	A set of rules that describe when the event is scheduled.
Short	When the event is to occur
Control	10..1
Type	Element
Is Modifier	false
Summary	true
Requirements	Many timing schedules are determined by regular repetitions.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) tim-1: if there's a duration, there needs to be duration units (`duration.empty() or durationUnit.exists()`) tim-2: if there's a period, there needs to be period units (`period.empty() or periodUnit.exists()`) tim-4: duration SHALL be a non-negative value (`duration.exists() implies duration >= 0`) tim-5: period SHALL be a non-negative value (`period.exists() implies period >= 0`) tim-6: If there's a periodMax, there must be a period (`periodMax.empty() or period.exists()`) tim-7: If there's a durationMax, there must be a duration (`durationMax.empty() or duration.exists()`) tim-8: If there's a countMax, there must be a count (`countMax.empty() or count.exists()`) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (`offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))`) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (`timeOfDay.empty() or when.empty()`) tim-1: if there's a duration, there needs to be duration units (duration.empty() or durationUnit.exists()) tim-2: if there's a period, there needs to be period units (period.empty() or periodUnit.exists()) tim-4: duration SHALL be a non-negative value (duration.exists() implies duration >= 0) tim-5: period SHALL be a non-negative value (period.exists() implies period >= 0) tim-6: If there's a periodMax, there must be a period (periodMax.empty() or period.exists()) tim-7: If there's a durationMax, there must be a duration (durationMax.empty() or duration.exists()) tim-8: If there's a countMax, there must be a count (countMax.empty() or count.exists()) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (timeOfDay.empty() or when.empty())
26. Extension.extension:Rolling.value[x].repeat.count
Definition	A total count of the desired number of repetitions across the duration of the entire timing specification. If countMax is present, this element indicates the lower bound of the allowed range of count values.
Short	Number of times to repeat
Comments	If you have both bounds and count, then this should be understood as within the bounds period, until count times happens.
Control	10..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Repetitions may be limited by end time or total occurrences.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
28. Extension.extension:Rolling.value[x].repeat.period
Definition	Indicates the duration of time over which repetitions are to occur; e.g. to express "3 times per day", 3 would be the frequency and "1 day" would be the period. If periodMax is present, this element indicates the lower bound of the allowed range of the period length.
Short	Event occurs frequency times per period
Control	10..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
30. Extension.extension:Rolling.value[x].repeat.periodUnit
Definition	The units of time for the period in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTimehttp://hl7.org/fhir/ValueSet/units-of-time\|4.0.1 A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
32. Extension.extension:MaximumDaily
Slice Name	MaximumDaily
Definition	An Extension
Short	Indicator of maximum daily amount.Additional content defined by implementations
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
34. Extension.extension:MaximumDaily.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..0*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
36. Extension.extension:MaximumDaily.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	MaximumDaily
38. Extension.extension:MaximumDaily.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Type	Quantity, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
40. Extension.extension:MaximumDaily.value[x].value
Definition	The value of the measured amount. The value includes an implicit precision in the presentation of the value.
Short	Numerical value (with implicit precision)
Comments	The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).
Control	10..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Precision is handled implicitly in almost all cases of measurement.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
42. Extension.extension:MaximumDaily.value[x].comparator
Definition	How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.
Short	< \| <= \| >= \| > - how to understand the value
Control	0..1
Binding	The codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator\|4.0.1 How the Quantity should be understood and represented.
Type	code
Is Modifier	true because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
Meaning if Missing	If there is no comparator, then there is no modification of the value
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
44. Extension.extension:DaysSupply
Slice Name	DaysSupply
Definition	An Extension
Short	Indicator of number of therapy days over time period.Additional content defined by implementations
Control	0..1*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
46. Extension.extension:DaysSupply.extension
Definition	An Extension May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	ExtensionAdditional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..0*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
48. Extension.extension:DaysSupply.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	DaysSupply
50. Extension.extension:DaysSupply.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	10..1
Type	Timing, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, decimal, CodeableConcept, ParameterDefinition, dateTime, code, string, Contributor, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, Signature, unsignedInt, time
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
52. Extension.extension:DaysSupply.value[x].modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Short	Extensions that cannot be ignored even if unrecognized
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
Summary	true
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Alternate Names	extensions, user content, modifiers
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
54. Extension.extension:DaysSupply.value[x].event
Definition	Identifies specific times when the event occurs.
Short	When the event occurs
Control	0..0*
Type	dateTime
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	In a Medication Administration Record, for instance, you need to take a general specification, and turn it into a precise specification.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
56. Extension.extension:DaysSupply.value[x].repeat
Definition	A set of rules that describe when the event is scheduled.
Short	When the event is to occur
Control	10..1
Type	Element
Is Modifier	false
Summary	true
Requirements	Many timing schedules are determined by regular repetitions.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) tim-1: if there's a duration, there needs to be duration units (`duration.empty() or durationUnit.exists()`) tim-2: if there's a period, there needs to be period units (`period.empty() or periodUnit.exists()`) tim-4: duration SHALL be a non-negative value (`duration.exists() implies duration >= 0`) tim-5: period SHALL be a non-negative value (`period.exists() implies period >= 0`) tim-6: If there's a periodMax, there must be a period (`periodMax.empty() or period.exists()`) tim-7: If there's a durationMax, there must be a duration (`durationMax.empty() or duration.exists()`) tim-8: If there's a countMax, there must be a count (`countMax.empty() or count.exists()`) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (`offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))`) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (`timeOfDay.empty() or when.empty()`) tim-1: if there's a duration, there needs to be duration units (duration.empty() or durationUnit.exists()) tim-2: if there's a period, there needs to be period units (period.empty() or periodUnit.exists()) tim-4: duration SHALL be a non-negative value (duration.exists() implies duration >= 0) tim-5: period SHALL be a non-negative value (period.exists() implies period >= 0) tim-6: If there's a periodMax, there must be a period (periodMax.empty() or period.exists()) tim-7: If there's a durationMax, there must be a duration (durationMax.empty() or duration.exists()) tim-8: If there's a countMax, there must be a count (countMax.empty() or count.exists()) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (timeOfDay.empty() or when.empty())
58. Extension.extension:DaysSupply.value[x].repeat.bounds[x]
Definition	Either a duration for the length of the timing schedule, a range of possible length, or outer bounds for start and/or end limits of the timing schedule.
Short	Length/Range of lengths, or (Start and/or end) limits
Control	10..1
Type	Duration, Period, Range
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
60. Extension.extension:DaysSupply.value[x].repeat.bounds[x].value
Definition	The value of the measured amount. The value includes an implicit precision in the presentation of the value.
Short	Numerical value (with implicit precision)
Comments	The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).
Control	10..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Precision is handled implicitly in almost all cases of measurement.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
62. Extension.extension:DaysSupply.value[x].repeat.bounds[x].comparator
Definition	How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.
Short	< \| <= \| >= \| > - how to understand the value
Control	0..1
Binding	The codes SHALL be taken from QuantityComparatorhttp://hl7.org/fhir/ValueSet/quantity-comparator\|4.0.1 How the Quantity should be understood and represented.
Type	code
Is Modifier	true because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
Meaning if Missing	If there is no comparator, then there is no modification of the value
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
64. Extension.extension:DaysSupply.value[x].repeat.bounds[x].system
Definition	The identification of the system that provides the coded form of the unit.
Short	System that defines coded unit form
Control	0..1 This element is affected by the following invariants: qty-3
Type	uri
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need to know the system that defines the coded form of the unit.
Pattern Value	http://unitsofmeasure.org
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
66. Extension.extension:DaysSupply.value[x].repeat.bounds[x].code
Definition	A computer processable form of the unit in some unit representation system.
Short	Coded form of the unit
Comments	The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.
Control	0..1
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
68. Extension.extension:DaysSupply.value[x].repeat.count
Definition	A total count of the desired number of repetitions across the duration of the entire timing specification. If countMax is present, this element indicates the lower bound of the allowed range of count values.
Short	Number of times to repeat
Comments	If you have both bounds and count, then this should be understood as within the bounds period, until count times happens.
Control	10..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Repetitions may be limited by end time or total occurrences.
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
70. Extension.extension:DaysSupply.value[x].repeat.period
Definition	Indicates the duration of time over which repetitions are to occur; e.g. to express "3 times per day", 3 would be the frequency and "1 day" would be the period. If periodMax is present, this element indicates the lower bound of the allowed range of the period length.
Short	Event occurs frequency times per period
Control	10..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
72. Extension.extension:DaysSupply.value[x].repeat.periodUnit
Definition	The units of time for the period in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTimehttp://hl7.org/fhir/ValueSet/units-of-time\|4.0.1 A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
74. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-QuantityLimitDetail-extension
76. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..01
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition	A detailed definition of the quantity limits the coverage plan imposes on this drug. These limit details may include (potentially including a rolling dispense limit, maximum daily, or therapy days for a period of time. (Only include if QuantityLimit = true)
Short	Quantity Limit Detail
Control	0..* This element is affected by the following invariants: ele-1
Is Modifier	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
2. Extension.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
4. Extension.extension
Definition	An Extension
Short	Extension
Control	1..*
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
6. Extension.extension:Description
Slice Name	Description
Definition	An Extension
Short	A human readable description of quantity limits.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
8. Extension.extension:Description.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
10. Extension.extension:Description.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
12. Extension.extension:Description.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	Description
14. Extension.extension:Description.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Type	string
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
16. Extension.extension:Rolling
Slice Name	Rolling
Definition	An Extension
Short	Indicator of dispense amount limit per time period.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
18. Extension.extension:Rolling.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
20. Extension.extension:Rolling.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
22. Extension.extension:Rolling.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	Rolling
24. Extension.extension:Rolling.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Type	Timing
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
26. Extension.extension:Rolling.value[x].id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
28. Extension.extension:Rolling.value[x].extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
30. Extension.extension:Rolling.value[x].modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Short	Extensions that cannot be ignored even if unrecognized
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
Summary	true
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Alternate Names	extensions, user content, modifiers
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
32. Extension.extension:Rolling.value[x].event
Definition	Identifies specific times when the event occurs.
Short	When the event occurs
Control	0..0
Type	dateTime
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	In a Medication Administration Record, for instance, you need to take a general specification, and turn it into a precise specification.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
34. Extension.extension:Rolling.value[x].repeat
Definition	A set of rules that describe when the event is scheduled.
Short	When the event is to occur
Control	1..1
Type	Element
Is Modifier	false
Summary	true
Requirements	Many timing schedules are determined by regular repetitions.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) tim-1: if there's a duration, there needs to be duration units (`duration.empty() or durationUnit.exists()`) tim-2: if there's a period, there needs to be period units (`period.empty() or periodUnit.exists()`) tim-4: duration SHALL be a non-negative value (`duration.exists() implies duration >= 0`) tim-5: period SHALL be a non-negative value (`period.exists() implies period >= 0`) tim-6: If there's a periodMax, there must be a period (`periodMax.empty() or period.exists()`) tim-7: If there's a durationMax, there must be a duration (`durationMax.empty() or duration.exists()`) tim-8: If there's a countMax, there must be a count (`countMax.empty() or count.exists()`) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (`offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))`) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (`timeOfDay.empty() or when.empty()`)
36. Extension.extension:Rolling.value[x].repeat.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
38. Extension.extension:Rolling.value[x].repeat.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].repeat.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
40. Extension.extension:Rolling.value[x].repeat.bounds[x]
Definition	Either a duration for the length of the timing schedule, a range of possible length, or outer bounds for start and/or end limits of the timing schedule.
Short	Length/Range of lengths, or (Start and/or end) limits
Control	0..1
Type	Choice of: Duration, Range, Period
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
42. Extension.extension:Rolling.value[x].repeat.count
Definition	A total count of the desired number of repetitions across the duration of the entire timing specification. If countMax is present, this element indicates the lower bound of the allowed range of count values.
Short	Number of times to repeat
Comments	If you have both bounds and count, then this should be understood as within the bounds period, until count times happens.
Control	1..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Repetitions may be limited by end time or total occurrences.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
44. Extension.extension:Rolling.value[x].repeat.countMax
Definition	If present, indicates that the count is a range - so to perform the action between [count] and [countMax] times.
Short	Maximum number of times to repeat
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
46. Extension.extension:Rolling.value[x].repeat.duration
Definition	How long this thing happens for when it happens. If durationMax is present, this element indicates the lower bound of the allowed range of the duration.
Short	How long when it happens
Comments	For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise).
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Some activities are not instantaneous and need to be maintained for a period of time.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
48. Extension.extension:Rolling.value[x].repeat.durationMax
Definition	If present, indicates that the duration is a range - so to perform the action between [duration] and [durationMax] time length.
Short	How long when it happens (Max)
Comments	For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise).
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Some activities are not instantaneous and need to be maintained for a period of time.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
50. Extension.extension:Rolling.value[x].repeat.durationUnit
Definition	The units of time for the duration, in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTime A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
52. Extension.extension:Rolling.value[x].repeat.frequency
Definition	The number of times to repeat the action within the specified period. If frequencyMax is present, this element indicates the lower bound of the allowed range of the frequency.
Short	Event occurs frequency times per period
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Meaning if Missing	If no frequency is stated, the assumption is that the event occurs once per period, but systems SHOULD always be specific about this
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
54. Extension.extension:Rolling.value[x].repeat.frequencyMax
Definition	If present, indicates that the frequency is a range - so to repeat between [frequency] and [frequencyMax] times within the period or period range.
Short	Event occurs up to frequencyMax times per period
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
56. Extension.extension:Rolling.value[x].repeat.period
Definition	Indicates the duration of time over which repetitions are to occur; e.g. to express "3 times per day", 3 would be the frequency and "1 day" would be the period. If periodMax is present, this element indicates the lower bound of the allowed range of the period length.
Short	Event occurs frequency times per period
Control	1..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
58. Extension.extension:Rolling.value[x].repeat.periodMax
Definition	If present, indicates that the period is a range from [period] to [periodMax], allowing expressing concepts such as "do this once every 3-5 days.
Short	Upper limit of period (3-4 hours)
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
60. Extension.extension:Rolling.value[x].repeat.periodUnit
Definition	The units of time for the period in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTime A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
62. Extension.extension:Rolling.value[x].repeat.dayOfWeek
Definition	If one or more days of week is provided, then the action happens only on the specified day(s).
Short	mon \| tue \| wed \| thu \| fri \| sat \| sun
Comments	If no days are specified, the action is assumed to happen every day as otherwise specified. The elements frequency and period cannot be used as well as dayOfWeek.
Control	0..*
Binding	The codes SHALL be taken from DaysOfWeek
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
64. Extension.extension:Rolling.value[x].repeat.timeOfDay
Definition	Specified time of day for action to take place.
Short	Time of day for action
Comments	When time of day is specified, it is inferred that the action happens every day (as filtered by dayofWeek) on the specified times. The elements when, frequency and period cannot be used as well as timeOfDay.
Control	0..*
Type	time
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
66. Extension.extension:Rolling.value[x].repeat.when
Definition	An approximate time period during the day, potentially linked to an event of daily living that indicates when the action should occur.
Short	Code for time period of occurrence
Comments	When more than one event is listed, the event is tied to the union of the specified events.
Control	0..*
Binding	The codes SHALL be taken from EventTiming Real world event relating to the schedule.
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Timings are frequently determined by occurrences such as waking, eating and sleep.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
68. Extension.extension:Rolling.value[x].repeat.offset
Definition	The number of minutes from the event. If the event code does not indicate whether the minutes is before or after the event, then the offset is assumed to be after the event.
Short	Minutes from event (before or after)
Control	0..1
Type	unsignedInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
70. Extension.extension:Rolling.value[x].code
Definition	A code for the timing schedule (or just text in code.text). Some codes such as BID are ubiquitous, but many institutions define their own additional codes. If a code is provided, the code is understood to be a complete statement of whatever is specified in the structured timing data, and either the code or the data may be used to interpret the Timing, with the exception that .repeat.bounds still applies over the code (and is not contained in the code).
Short	BID \| TID \| QID \| AM \| PM \| QD \| QOD \| +
Comments	BID etc. are defined as 'at institutionally specified times'. For example, an institution may choose that BID is "always at 7am and 6pm". If it is inappropriate for this choice to be made, the code BID should not be used. Instead, a distinct organization-specific code should be used in place of the HL7-defined BID code and/or a structured representation should be used (in this case, specifying the two event times).
Control	0..1
Binding	The codes SHOULD be taken from TimingAbbreviation Code for a known / defined timing pattern.
Type	CodeableConcept
Is Modifier	false
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
72. Extension.extension:MaximumDaily
Slice Name	MaximumDaily
Definition	An Extension
Short	Indicator of maximum daily amount.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
74. Extension.extension:MaximumDaily.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
76. Extension.extension:MaximumDaily.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
78. Extension.extension:MaximumDaily.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	MaximumDaily
80. Extension.extension:MaximumDaily.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Type	Quantity
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
82. Extension.extension:MaximumDaily.value[x].id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
84. Extension.extension:MaximumDaily.value[x].extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
86. Extension.extension:MaximumDaily.value[x].value
Definition	The value of the measured amount. The value includes an implicit precision in the presentation of the value.
Short	Numerical value (with implicit precision)
Comments	The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).
Control	1..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Precision is handled implicitly in almost all cases of measurement.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
88. Extension.extension:MaximumDaily.value[x].comparator
Definition	How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.
Short	< \| <= \| >= \| > - how to understand the value
Control	0..1
Binding	The codes SHALL be taken from QuantityComparator How the Quantity should be understood and represented.
Type	code
Is Modifier	true because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
Meaning if Missing	If there is no comparator, then there is no modification of the value
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
90. Extension.extension:MaximumDaily.value[x].unit
Definition	A human-readable form of the unit.
Short	Unit representation
Control	0..1
Type	string
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
92. Extension.extension:MaximumDaily.value[x].system
Definition	The identification of the system that provides the coded form of the unit.
Short	System that defines coded unit form
Control	0..1 This element is affected by the following invariants: qty-3
Type	uri
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need to know the system that defines the coded form of the unit.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
94. Extension.extension:MaximumDaily.value[x].code
Definition	A computer processable form of the unit in some unit representation system.
Short	Coded form of the unit
Comments	The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.
Control	0..1
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
96. Extension.extension:DaysSupply
Slice Name	DaysSupply
Definition	An Extension
Short	Indicator of number of therapy days over time period.
Control	0..1
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
98. Extension.extension:DaysSupply.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
100. Extension.extension:DaysSupply.extension
Definition	An Extension
Short	Extension
Control	0..0
Type	Extension
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
102. Extension.extension:DaysSupply.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	DaysSupply
104. Extension.extension:DaysSupply.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	1..1
Type	Timing
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
106. Extension.extension:DaysSupply.value[x].id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
108. Extension.extension:DaysSupply.value[x].extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
110. Extension.extension:DaysSupply.value[x].modifierExtension
Definition	May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).
Short	Extensions that cannot be ignored even if unrecognized
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	true because Modifier extensions are expected to modify the meaning or interpretation of the element that contains them
Summary	true
Requirements	Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions.
Alternate Names	extensions, user content, modifiers
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
112. Extension.extension:DaysSupply.value[x].event
Definition	Identifies specific times when the event occurs.
Short	When the event occurs
Control	0..0
Type	dateTime
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	In a Medication Administration Record, for instance, you need to take a general specification, and turn it into a precise specification.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
114. Extension.extension:DaysSupply.value[x].repeat
Definition	A set of rules that describe when the event is scheduled.
Short	When the event is to occur
Control	1..1
Type	Element
Is Modifier	false
Summary	true
Requirements	Many timing schedules are determined by regular repetitions.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) tim-1: if there's a duration, there needs to be duration units (`duration.empty() or durationUnit.exists()`) tim-2: if there's a period, there needs to be period units (`period.empty() or periodUnit.exists()`) tim-4: duration SHALL be a non-negative value (`duration.exists() implies duration >= 0`) tim-5: period SHALL be a non-negative value (`period.exists() implies period >= 0`) tim-6: If there's a periodMax, there must be a period (`periodMax.empty() or period.exists()`) tim-7: If there's a durationMax, there must be a duration (`durationMax.empty() or duration.exists()`) tim-8: If there's a countMax, there must be a count (`countMax.empty() or count.exists()`) tim-9: If there's an offset, there must be a when (and not C, CM, CD, CV) (`offset.empty() or (when.exists() and ((when in ('C' \| 'CM' \| 'CD' \| 'CV')).not()))`) tim-10: If there's a timeOfDay, there cannot be a when, or vice versa (`timeOfDay.empty() or when.empty()`)
116. Extension.extension:DaysSupply.value[x].repeat.id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
118. Extension.extension:DaysSupply.value[x].repeat.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].repeat.extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
120. Extension.extension:DaysSupply.value[x].repeat.bounds[x]
Definition	Either a duration for the length of the timing schedule, a range of possible length, or outer bounds for start and/or end limits of the timing schedule.
Short	Length/Range of lengths, or (Start and/or end) limits
Control	1..1
Type	Duration
[x] Note	See Choice of Data Types for further information about how to use [x]
Is Modifier	false
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
122. Extension.extension:DaysSupply.value[x].repeat.bounds[x].id
Definition	Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Short	Unique id for inter-element referencing
Control	0..1
Type	string
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
124. Extension.extension:DaysSupply.value[x].repeat.bounds[x].extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Short	Additional content defined by implementations
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Control	0..*
Type	Extension
Is Modifier	false
Summary	false
Alternate Names	extensions, user content
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`) ext-1: Must have either extensions or value[x], not both (`extension.exists() != value.exists()`)
Slicing	This element introduces a set of slices on `Extension.extension.value[x].repeat.bounds[x].extension`. The slices are unordered and Open, and can be differentiated using the following discriminators: value @ url
126. Extension.extension:DaysSupply.value[x].repeat.bounds[x].value
Definition	The value of the measured amount. The value includes an implicit precision in the presentation of the value.
Short	Numerical value (with implicit precision)
Comments	The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books).
Control	1..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Precision is handled implicitly in almost all cases of measurement.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
128. Extension.extension:DaysSupply.value[x].repeat.bounds[x].comparator
Definition	How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value.
Short	< \| <= \| >= \| > - how to understand the value
Control	0..1
Binding	The codes SHALL be taken from QuantityComparator How the Quantity should be understood and represented.
Type	code
Is Modifier	true because This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.
Meaning if Missing	If there is no comparator, then there is no modification of the value
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
130. Extension.extension:DaysSupply.value[x].repeat.bounds[x].unit
Definition	A human-readable form of the unit.
Short	Unit representation
Control	0..1
Type	string
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
132. Extension.extension:DaysSupply.value[x].repeat.bounds[x].system
Definition	The identification of the system that provides the coded form of the unit.
Short	System that defines coded unit form
Control	0..1 This element is affected by the following invariants: qty-3
Type	uri
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need to know the system that defines the coded form of the unit.
Pattern Value	http://unitsofmeasure.org
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
134. Extension.extension:DaysSupply.value[x].repeat.bounds[x].code
Definition	A computer processable form of the unit in some unit representation system.
Short	Coded form of the unit
Comments	The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency. The context of use may additionally require a code from a particular system.
Control	0..1
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
136. Extension.extension:DaysSupply.value[x].repeat.count
Definition	A total count of the desired number of repetitions across the duration of the entire timing specification. If countMax is present, this element indicates the lower bound of the allowed range of count values.
Short	Number of times to repeat
Comments	If you have both bounds and count, then this should be understood as within the bounds period, until count times happens.
Control	1..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Repetitions may be limited by end time or total occurrences.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
138. Extension.extension:DaysSupply.value[x].repeat.countMax
Definition	If present, indicates that the count is a range - so to perform the action between [count] and [countMax] times.
Short	Maximum number of times to repeat
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
140. Extension.extension:DaysSupply.value[x].repeat.duration
Definition	How long this thing happens for when it happens. If durationMax is present, this element indicates the lower bound of the allowed range of the duration.
Short	How long when it happens
Comments	For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise).
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Some activities are not instantaneous and need to be maintained for a period of time.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
142. Extension.extension:DaysSupply.value[x].repeat.durationMax
Definition	If present, indicates that the duration is a range - so to perform the action between [duration] and [durationMax] time length.
Short	How long when it happens (Max)
Comments	For some events the duration is part of the definition of the event (e.g. IV infusions, where the duration is implicit in the specified quantity and rate). For others, it's part of the timing specification (e.g. exercise).
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Some activities are not instantaneous and need to be maintained for a period of time.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
144. Extension.extension:DaysSupply.value[x].repeat.durationUnit
Definition	The units of time for the duration, in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTime A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
146. Extension.extension:DaysSupply.value[x].repeat.frequency
Definition	The number of times to repeat the action within the specified period. If frequencyMax is present, this element indicates the lower bound of the allowed range of the frequency.
Short	Event occurs frequency times per period
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Meaning if Missing	If no frequency is stated, the assumption is that the event occurs once per period, but systems SHOULD always be specific about this
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
148. Extension.extension:DaysSupply.value[x].repeat.frequencyMax
Definition	If present, indicates that the frequency is a range - so to repeat between [frequency] and [frequencyMax] times within the period or period range.
Short	Event occurs up to frequencyMax times per period
Control	0..1
Type	positiveInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
150. Extension.extension:DaysSupply.value[x].repeat.period
Definition	Indicates the duration of time over which repetitions are to occur; e.g. to express "3 times per day", 3 would be the frequency and "1 day" would be the period. If periodMax is present, this element indicates the lower bound of the allowed range of the period length.
Short	Event occurs frequency times per period
Control	1..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
152. Extension.extension:DaysSupply.value[x].repeat.periodMax
Definition	If present, indicates that the period is a range from [period] to [periodMax], allowing expressing concepts such as "do this once every 3-5 days.
Short	Upper limit of period (3-4 hours)
Control	0..1
Type	decimal
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
154. Extension.extension:DaysSupply.value[x].repeat.periodUnit
Definition	The units of time for the period in UCUM units.
Short	s \| min \| h \| d \| wk \| mo \| a - unit of time (UCUM)
Control	0..1
Binding	The codes SHALL be taken from UnitsOfTime A unit of time (units from UCUM).
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Pattern Value	d
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
156. Extension.extension:DaysSupply.value[x].repeat.dayOfWeek
Definition	If one or more days of week is provided, then the action happens only on the specified day(s).
Short	mon \| tue \| wed \| thu \| fri \| sat \| sun
Comments	If no days are specified, the action is assumed to happen every day as otherwise specified. The elements frequency and period cannot be used as well as dayOfWeek.
Control	0..*
Binding	The codes SHALL be taken from DaysOfWeek
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
158. Extension.extension:DaysSupply.value[x].repeat.timeOfDay
Definition	Specified time of day for action to take place.
Short	Time of day for action
Comments	When time of day is specified, it is inferred that the action happens every day (as filtered by dayofWeek) on the specified times. The elements when, frequency and period cannot be used as well as timeOfDay.
Control	0..*
Type	time
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
160. Extension.extension:DaysSupply.value[x].repeat.when
Definition	An approximate time period during the day, potentially linked to an event of daily living that indicates when the action should occur.
Short	Code for time period of occurrence
Comments	When more than one event is listed, the event is tied to the union of the specified events.
Control	0..*
Binding	The codes SHALL be taken from EventTiming Real world event relating to the schedule.
Type	code
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Requirements	Timings are frequently determined by occurrences such as waking, eating and sleep.
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
162. Extension.extension:DaysSupply.value[x].repeat.offset
Definition	The number of minutes from the event. If the event code does not indicate whether the minutes is before or after the event, then the offset is assumed to be after the event.
Short	Minutes from event (before or after)
Control	0..1
Type	unsignedInt
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
164. Extension.extension:DaysSupply.value[x].code
Definition	A code for the timing schedule (or just text in code.text). Some codes such as BID are ubiquitous, but many institutions define their own additional codes. If a code is provided, the code is understood to be a complete statement of whatever is specified in the structured timing data, and either the code or the data may be used to interpret the Timing, with the exception that .repeat.bounds still applies over the code (and is not contained in the code).
Short	BID \| TID \| QID \| AM \| PM \| QD \| QOD \| +
Comments	BID etc. are defined as 'at institutionally specified times'. For example, an institution may choose that BID is "always at 7am and 6pm". If it is inappropriate for this choice to be made, the code BID should not be used. Instead, a distinct organization-specific code should be used in place of the HL7-defined BID code and/or a structured representation should be used (in this case, specifying the two event times).
Control	0..1
Binding	The codes SHOULD be taken from TimingAbbreviation Code for a known / defined timing pattern.
Type	CodeableConcept
Is Modifier	false
Summary	true
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)
166. Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Short	identifies the meaning of the extension
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Control	1..1
Type	uri
Is Modifier	false
XML Format	In the XML format, this property is represented as an attribute.
Summary	false
Fixed Value	http://hl7.org/fhir/us/davinci-drug-formulary/StructureDefinition/usdf-QuantityLimitDetail-extension
168. Extension.value[x]
Definition	Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Short	Value of extension
Control	0..0
Type	Choice of: base64Binary, boolean, canonical, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, url, uuid, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, ContactDetail, Contributor, DataRequirement, Expression, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Dosage, Meta
Is Modifier	false
Primitive Value	This primitive element may be present, or absent, or replaced by an extension
Summary	false
Invariants	ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)