EventDefinition resource (FHIR R4)

EventDefinition is the FHIR R4 resource for the EventDefinition resource provides a reusable description of when a particular event can occur.

Resource	EventDefinition
FHIR version	R4 (4.0.1)
Canonical URL	http://hl7.org/fhir/StructureDefinition/EventDefinition
Required elements	status (1..1), trigger (1..*)

Example

{
  "resourceType": "EventDefinition",
  "id": "eventdefinition-36fe3918921bb9a817b8472207958bd5",
  "status": "draft",
  "trigger": [
    {
      "type": "named-event"
    }
  ]
}

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

Validation context

strict pidgeon validate grades a EventDefinition 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 EventDefinition

Wire it into your AI agent:

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

Download Post free to browse this reference with generation attached.