Name Flags Card. Type Description & Constraints doco
. . Communication Σ DomainResource A record of information transmitted from a sender to a receiver
. . . identifier Σ 0..* Identifier Unique identifier
. . . category Σ 0..1 CodeableConcept Message category
. . . sender Σ 0..1 Reference( Device | Organization | Patient | Practitioner | RelatedPerson) Message sender
. . . recipient Σ 0..* Reference( Device | Organization | Patient | Practitioner | RelatedPerson | Group) Message recipient
. . . payload Σ 0..* BackboneElement Message payload
. . . . content[x] Σ 1..1 Message part content
. . . . . contentString string
. . . . . contentAttachment Attachment
. . . . . contentReference Reference( Any)
. . . medium Σ 0..* CodeableConcept A channel of communication
v3 Code System ParticipationMode ( Example)
. . . status ?! Σ 0..1 code in-progress | completed | suspended | rejected | failed
CommunicationStatus ( Required)
. . . encounter Σ 0..1 Reference( Encounter) Encounter leading to message
. . . sent Σ 0..1 dateTime When sent
. . . received Σ 0..1 dateTime When received
. . . reason Σ 0..* CodeableConcept Indication for message
. . . subject Σ 0..1 Reference( Patient) Focus of message
. . . requestDetail Σ 0..1 Reference( CommunicationRequest) CommunicationRequest producing this message

doco Documentation for this format