Immunization resource (FHIR R4)

Immunization is a FHIR R4 resource. The Pidgeon engine generates synthetic Immunization instances and validates them against the R4 structure definitions.

Example

{
  "resourceType": "Immunization",
  "id": "immunization-64a2e245ff5fc6f5239f2308aa24fb0d",
  "status": "completed",
  "vaccineCode": {
    "coding": [
      {
        "system": "http://hl7.org/fhir/sid/cvx",
        "code": "20",
        "display": "Diphtheria, tetanus toxoids, pertussis"
      },
      {
        "system": "http://snomed.info/sct",
        "code": "omitted",
        "display": "SNOMED CT code omitted from this published example"
      }
    ],
    "text": "Diphtheria, tetanus toxoids, pertussis"
  },
  "patient": {
    "reference": "Patient/patient-L46A6EIB9J"
  },
  "occurrenceDateTime": "2026-03-28T12:00:00Z",
  "lotNumber": "LOT-89283-A",
  "site": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-ActSite",
        "code": "LA",
        "display": "Left arm"
      }
    ]
  },
  "route": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-RouteOfAdministration",
        "code": "IM",
        "display": "Injection, intramuscular"
      }
    ]
  },
  "performer": [
    {
      "function": {
        "coding": [
          {
            "system": "http://terminology.hl7.org/CodeSystem/v2-0443",
            "code": "AP",
            "display": "Administering Provider"
          }
        ]
      },
      "actor": {
        "display": "Nurse Smith, RN"
      }
    }
  ]
}

Generated by the Pidgeon engine: pidgeon generate Immunization --seed 20260722. Codes from licensed terminologies (LOINC, SNOMED CT, CPT, RxNorm) are omitted from published examples.

Validation context

• strict pidgeon validate grades a Immunization instance against the base R4 structure definition: missing required elements raise REQUIRED_FIELD_MISSING and cardinality violations raise CARDINALITY_MIN or CARDINALITY_MAX.(REQUIRED_FIELD_MISSING)
• strict Profile validation grades the same instance against an installed IG profile: profile cardinality findings carry FHIR-PROFILE-CARDINALITY and terminology binding findings carry FHIR-PROFILE-BINDING.(FHIR-PROFILE-CARDINALITY)