NameFlagsCard.TypeDescription & Constraintsdoco
.. Communication ΣDomainResourceA record of information transmitted from a sender to a receiver
... identifier Σ0..*IdentifierUnique identifier
... category Σ0..1CodeableConceptMessage category
... sender Σ0..1Reference(Device | Organization | Patient | Practitioner | RelatedPerson)Message sender
... recipient Σ0..*Reference(Device | Organization | Patient | Practitioner | RelatedPerson | Group)Message recipient
... payload Σ0..*BackboneElementMessage payload
.... content[x] Σ1..1Message part content
..... contentStringstring
..... contentAttachmentAttachment
..... contentReferenceReference(Any)
... medium Σ0..*CodeableConceptA channel of communication
v3 Code System ParticipationMode (Example)
... status ?! Σ0..1codein-progress | completed | suspended | rejected | failed
CommunicationStatus (Required)
... encounter Σ0..1Reference(Encounter)Encounter leading to message
... sent Σ0..1dateTimeWhen sent
... received Σ0..1dateTimeWhen received
... reason Σ0..*CodeableConceptIndication for message
... subject Σ0..1Reference(Patient)Focus of message
... requestDetail Σ0..1Reference(CommunicationRequest)CommunicationRequest producing this message

doco Documentation for this format