description: Extension to capture the age of onset of a rare disease using structured HPO age of onset terms
package_name: de.medizininformatikinitiative.kerndatensatz.seltene
derivation: constraint
name: AgeOfOnset
type: Extension
elements:
  extension: {index: 0}
  url:
    pattern: {type: Uri, value: 'https://www.medizininformatik-initiative.de/fhir/ext/modul-seltene/StructureDefinition/mii-ex-seltene-age-of-onset'}
    index: 1
  value:
    short: HPO age of onset term
    choices: [valueCodeableConcept]
    index: 3
  valueCodeableConcept: {type: CodeableConcept, short: HPO age of onset term, choiceOf: value, index: 4}
package_version: 2026.0.0-ballot
extensions: {}
class: extension
kind: complex-type
url: https://www.medizininformatik-initiative.de/fhir/ext/modul-seltene/StructureDefinition/mii-ex-seltene-age-of-onset
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 2026.0.0-ballot