QI-Core Implementation Guide
8.0.0-ballot - STU 8 - ballot

QI-Core Implementation Guide, published by HL7 International / Clinical Quality Information. This guide is not an authorized publication; it is the continuous build for version 8.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-qi-core/ and changes regularly. See the Directory of published versions

## Extension: Code Options - Detailed Descriptions

Page standards status: Trial-use | Maturity Level: 1

Definitions for the codeOptions extension

- Key Elements Table
- Differential Table
- Snapshot Table

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

0. Extension
Definition | A logical reference (i.e. a reference to ValueSet.url) to a value set/version that identifies a set of possible coded values used to convey a higher level concept that encompasses a list of candidate specializations when there is no formal code defined for that purpose. For example, the concept of COVID preventative medications can be expressed as a value set because there is no specific code representing that concept. Optional Extension Element - found in all resources.
Short | Url of a value set of activitiesOptional Extensions Element
Comments | This extension SHALL NOT be used when an appropriate higher level concept code exists. When this extension is used on an element with a required binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set. When used with an extensible binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set unless none of the codes in the bound value set apply to the concept being communicated (based on human review). When this extension appears on a CodeableConcept, the CodeableConcept SHALL have no codings, and the text of the CodeableConcept SHALL include the title of the referenced value set.
Control | 0..1* 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 | 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`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
4. 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/StructureDefinition/codeOptions`
6. 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 | 10..1
Type | canonical(ValueSet), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, Range, RelatedArtifact, base64Binary, UsageContext, Timing, 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 | SeeChoice of Data Typesfor 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
Label | value set
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 foundhere

0. Extension
Definition | A logical reference (i.e. a reference to ValueSet.url) to a value set/version that identifies a set of possible coded values used to convey a higher level concept that encompasses a list of candidate specializations when there is no formal code defined for that purpose. For example, the concept of COVID preventative medications can be expressed as a value set because there is no specific code representing that concept.
Short | Url of a value set of activities
Comments | This extension SHALL NOT be used when an appropriate higher level concept code exists. When this extension is used on an element with a required binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set. When used with an extensible binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set unless none of the codes in the bound value set apply to the concept being communicated (based on human review). When this extension appears on a CodeableConcept, the CodeableConcept SHALL have no codings, and the text of the CodeableConcept SHALL include the title of the referenced value set.
Control | 0..1
Is Modifier | false
2. Extension.extension
Control | 0..0
4. Extension.url
Fixed Value | `http://hl7.org/fhir/StructureDefinition/codeOptions`
6. Extension.value[x]
Control | 1..?
Type | canonical(ValueSet), date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, Coding, SampledData, id, positiveInt, Distance, Period, Duration, Range, RelatedArtifact, base64Binary, UsageContext, Timing, 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 | SeeChoice of Data Typesfor further information about how to use [x]
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Label | value set

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

0. Extension
Definition | A logical reference (i.e. a reference to ValueSet.url) to a value set/version that identifies a set of possible coded values used to convey a higher level concept that encompasses a list of candidate specializations when there is no formal code defined for that purpose. For example, the concept of COVID preventative medications can be expressed as a value set because there is no specific code representing that concept.
Short | Url of a value set of activities
Comments | This extension SHALL NOT be used when an appropriate higher level concept code exists. When this extension is used on an element with a required binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set. When used with an extensible binding, the set of possible coded values in the referenced value set SHALL be present in the bound value set unless none of the codes in the bound value set apply to the concept being communicated (based on human review). When this extension appears on a CodeableConcept, the CodeableConcept SHALL have no codings, and the text of the CodeableConcept SHALL include the title of the referenced value set.
Control | 0..1 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 | 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`. The slices areUnordered and Open, and can be differentiated using the following discriminators: value @ url
6. 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/StructureDefinition/codeOptions`
8. 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 | 1..1
Type | canonical(ValueSet)
[x] Note | SeeChoice of Data Typesfor 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
Label | value set
Invariants | ele-1: All FHIR elements must have a @value or children (`hasValue() or (children().count() > id.count())`)