identifierΣ0..*Identifier
statusΣ ?!1..1codeBinding
categoryΣ0..1CodeableConcept
codeΣ1..1CodeableConcept
subjectΣ I1..1Reference(Patient | Location | Group | Organization | Practitioner | PlanDefinition | Medication | Procedure)
periodΣ I0..1Period
encounterΣ I0..1Reference(Encounter)
authorΣ I0..1Reference(Device | Organization | Patient | Practitioner)