{
  "resourceType": "StructureDefinition",
  "id": "itcc-core-Condition",
  "url": "https://www.itcc-consortium.org/fhir/StructureDefinition/itcc-core-Condition",
  "name": "itcc-core-Condition",
  "title": "ITCC Condition (Diagnosis + Event)",
  "status": "active",
  "date": "2025-04-28",
  "publisher": "ITCC Consortium",
  "description": "Condition profile aligned to ITCC mapping for Diagnosis and Event (Relapse/Progression). Includes diagnosis code (with optional WHO coding), age in months, date of diagnosis/event, type (primary/relapse/progression/unknown), disease extent reference, and patient reference.",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Condition",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Condition",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Condition.id",
        "path": "Condition.id",
        "short": "FHIR id",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Condition.subject",
        "path": "Condition.subject",
        "short": "Reference to the patient",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Condition.code",
        "path": "Condition.code",
        "short": "Code of the diagnosis",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Condition.code.coding",
        "path": "Condition.code.coding",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "system"
            }
          ],
          "rules": "open"
        },
        "short": "Diagnosis codings",
        "definition": "coding[1] = ITCC diagnosis list, coding[2] = WHO list (optional).",
        "min": 1,
        "max": "2",
        "mustSupport": true
      },
      {
        "id": "Condition.code.coding:diagnosis",
        "path": "Condition.code.coding",
        "sliceName": "diagnosis",
        "short": "Diagnosis code (ITCC list)",
        "min": 1,
        "max": "1",
        "mustSupport": true,
        "binding": {
          "strength": "required",
          "valueSet": "https://www.itcc-consortium.org/fhir/ValueSet/itcc-core-clinical-diagnosis-vs"
        }
      },
      {
        "id": "Condition.code.coding:who",
        "path": "Condition.code.coding",
        "sliceName": "who",
        "short": "WHO list code",
        "min": 0,
        "max": "1",
        "mustSupport": false
      },
      {
        "id": "Condition.onsetAge",
        "path": "Condition.onsetAge",
        "short": "Age in months",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Condition.onsetAge.value",
        "path": "Condition.onsetAge.value",
        "short": "Age value",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Condition.onsetAge.system",
        "path": "Condition.onsetAge.system",
        "min": 1,
        "max": "1",
        "fixedUri": "http://unitsofmeasure.org"
      },
      {
        "id": "Condition.onsetAge.code",
        "path": "Condition.onsetAge.code",
        "min": 1,
        "max": "1",
        "fixedCode": "mo"
      },
      {
        "id": "Condition.onsetAge.unit",
        "path": "Condition.onsetAge.unit",
        "min": 0,
        "max": "1"
      },
      {
        "id": "Condition.onsetDateTime",
        "path": "Condition.onsetDateTime",
        "short": "Date of diagnosis/event",
        "min": 1,
        "max": "1",
        "mustSupport": true
      },
      {
        "id": "Condition.category",
        "path": "Condition.category",
        "short": "Condition type",
        "definition": "primary | relapse | progression | unknown",
        "min": 1,
        "max": "1",
        "mustSupport": true,
        "binding": {
          "strength": "required",
          "valueSet": "https://www.itcc-consortium.org/fhir/ValueSet/itcc-core-disease-evolution-vs"
        }
      },
      {
        "id": "Condition.stage",
        "path": "Condition.stage",
        "short": "Stage container",
        "min": 1,
        "max": "1"
      },
      {
        "id": "Condition.stage.assessment",
        "path": "Condition.stage.assessment",
        "short": "Reference to Disease Extent",
        "min": 1,
        "max": "1",
        "mustSupport": true
      }
    ]
  }
}