{
  "description": "Extension to capture the age at onset of a condition. This backports the onsetAge functionality from FHIR R5 to R4.",
  "_filename": "StructureDefinition-mii-ext-seltene-onset-age.json",
  "package_name": "de.medizininformatikinitiative.kerndatensatz.seltene",
  "date": null,
  "derivation": "constraint",
  "publisher": "Medizininformatik Initiative",
  "fhirVersion": "4.0.1",
  "name": "OnsetAge",
  "abstract": false,
  "type": "Extension",
  "experimental": null,
  "resourceType": "StructureDefinition",
  "title": "Onset Age Extension",
  "package_version": "2026.0.0-ballot",
  "status": "draft",
  "id": "3effdbeb-f7e8-47c5-9ba4-c17c22db3c69",
  "kind": "complex-type",
  "url": "https://www.medizininformatik-initiative.de/fhir/ext/modul-seltene/StructureDefinition/mii-ext-seltene-onset-age",
  "context": [ {
    "type": "element",
    "expression": "Condition.onset[x]"
  } ],
  "version": "2026.0.0-ballot",
  "differential": {
    "element": [ {
      "id": "Extension",
      "path": "Extension",
      "short": "Onset Age Extension",
      "definition": "Extension to capture the age at onset of a condition. This backports the onsetAge functionality from FHIR R5 to R4."
    }, {
      "id": "Extension.extension",
      "max": "0",
      "path": "Extension.extension"
    }, {
      "id": "Extension.url",
      "path": "Extension.url",
      "fixedUri": "https://www.medizininformatik-initiative.de/fhir/ext/modul-seltene/StructureDefinition/mii-ext-seltene-onset-age"
    }, {
      "id": "Extension.value[x]",
      "path": "Extension.value[x]",
      "type": [ {
        "code": "Age"
      } ],
      "short": "Alter bei Erkrankungsbeginn",
      "comment": "Diese Erweiterung ermöglicht es, das Alter bei Erkrankungsbeginn anzugeben, ähnlich der onsetAge-Funktionalität in FHIR R5",
      "definition": "Das Alter des Patienten zum Zeitpunkt des Erkrankungsbeginns",
      "mustSupport": true
    }, {
      "id": "Extension.value[x].value",
      "min": 1,
      "path": "Extension.value[x].value",
      "short": "Numerischer Alterswert"
    }, {
      "id": "Extension.value[x].unit",
      "min": 1,
      "path": "Extension.value[x].unit",
      "short": "Alterseinheit"
    }, {
      "id": "Extension.value[x].system",
      "min": 1,
      "path": "Extension.value[x].system",
      "fixedUri": "http://unitsofmeasure.org"
    }, {
      "id": "Extension.value[x].code",
      "min": 1,
      "path": "Extension.value[x].code",
      "short": "UCUM-Code für Alterseinheit",
      "binding": {
        "strength": "required",
        "valueSet": "http://hl7.org/fhir/ValueSet/age-units"
      }
    } ]
  },
  "contact": [ {
    "telecom": [ {
      "value": "https://www.medizininformatik-initiative.de",
      "system": "url"
    } ]
  } ],
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}