FHIR Extensions Pack
5.3.0 - May 2026 International flag

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.3.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

Extension: CodeSystem Authoritative Source

Official URL: http://hl7.org/fhir/StructureDefinition/codesystem-authoritativeSource Version: 5.3.0
Standards status: Deprecated Maturity Level: 2 Responsible: HL7 International / Terminology Infrastructure Computable Name: CSAuthoritativeSource
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1138

DEPRECATED: Use artifact-authoritativeSource instead. A reference to the authoritative, human readable, source of truth for the code system information. External code system information can be found in THO or the relevant HTA confluence pages.

Context of Use

This extension is deprecated and should no longer be used

This extension has been deprecated in favor of the more general artifact-authoritativeSource resource.

This extension may be used on the following element(s)

Usage info

Usages:

  • This Extension is not used by any profiles in this Specification

You can also check for usages in the FHIR IG Statistics

Changes since version 5.3.0:

  • No changes

    • Formal Views of Extension Content

    Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

    This structure is derived from Extension

    Summary

    Simple Extension with the type uri: DEPRECATED: Use artifact-authoritativeSource instead. A reference to the authoritative, human readable, source of truth for the code system information. External code system information can be found in THO or the relevant HTA confluence pages.

    Maturity: 2

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Reference to the current trusted source of the CodeSystem resource
    Extension.extension 0..0 Extension
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/codesystem-authoritativeSource"
    Extension.value[x] 1..1 uri Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Reference to the current trusted source of the CodeSystem resource
    Extension.id 0..1 id Unique id for inter-element referencing
    Extension.extension 0..0 Extension
    Slice: Unordered, Open by value:url

    Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/codesystem-authoritativeSource"
    Extension.value[x] 1..1 uri Value of extension

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type uri: DEPRECATED: Use artifact-authoritativeSource instead. A reference to the authoritative, human readable, source of truth for the code system information. External code system information can be found in THO or the relevant HTA confluence pages.

    Maturity: 2

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Reference to the current trusted source of the CodeSystem resource
    Extension.extension 0..0 Extension
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/codesystem-authoritativeSource"
    Extension.value[x] 1..1 uri Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: doco
    Extension 0..1 Extension Reference to the current trusted source of the CodeSystem resource
    Extension.id 0..1 id Unique id for inter-element referencing
    Extension.extension 0..0 Extension
    Slice: Unordered, Open by value:url

    Slicing Note: The rules on this element (including its children) apply to all the slices, but are not repeated in them
    Extension.url 1..1 uri "http://hl7.org/fhir/StructureDefinition/codesystem-authoritativeSource"
    Extension.value[x] 1..1 uri Value of extension

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Constraints

    Id Grade Path(s) Description Expression
    ele-1 error **ALL** elements All FHIR elements must have a @value or children hasValue() or (children().count() > id.count())
    ext-1 error **ALL** extensions Must have either extensions or value[x], not both extension.exists() != value.exists()

    R4B

    The extension is unchanged in R4B

    R4

    The extension is unchanged in R4

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)