QI-Core Implementation Guide
4.1.0 - release

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## Extension: DiagnosisPresentOnAdmissionExtension - Detailed Descriptions

Definitions for the qicore-encounter-diagnosisPresentOnAdmission extension.

1. Extension
Definition | Indicator of whether the Encounter diagnosis was present at the time of admission.
Control | 1..1 This element is affected by the following invariants: ele-1
Invariants | Defined on this element 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.
Control | 0..1
Type | string
3. Extension.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.
Control | 0..*
Type | Extension
Alternate Names | extensions, user content
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.
Invariants | Defined on this element 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.url
Definition | Source of the definition for the extension code - a logical name or a URL.
Control | 1..1
Type | uri
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.
Fixed Value | http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-encounter-diagnosisPresentOnAdmission
5. Extension.value[x]
Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).
Control | 0..1
Binding | The codes SHALL be taken from QICore Present On Admission Codes Indicator of whether the Encounter diagnosis was present at the time of admission
Type | CodeableConcept
[x] Note | See Choice of Data Types for further information about how to use [x]
Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))