Flag resource (FHIR R4)

Flag is the FHIR R4 resource for prospective warnings of potential issues when providing care to the patient.

Resource	Flag
FHIR version	R4 (4.0.1)
Canonical URL	http://hl7.org/fhir/StructureDefinition/Flag
Required elements	status (1..1), code (1..1), subject (1..1)

Example

{
  "resourceType": "Flag",
  "id": "flag-482b9e96e9fdd27defdbf33221a65c9f",
  "status": "active",
  "code": {
    "text": "Synthetic value"
  },
  "subject": {
    "reference": "Patient/patient-f5f0be5aeeb0b38c8aa61d84ad07c1a4"
  }
}

Generated by the Pidgeon engine: pidgeon generate Flag --seed 20260722.

Validation context

strict pidgeon validate grades a Flag 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)

This answer, in your terminal

pidgeon lookup Flag

Wire it into your AI agent:

claude mcp add pidgeon -- npx -y @pidgeonhealth/mcp

Download Post free to browse this reference with generation attached.