{
  "resourceType" : "CommunicationRequest",
  "identifier" : [" Identifier "], 
  "category" : " CodeableConcept ", 
  "sender" : " Reference(Device|Organization|Patient|Practitioner|RelatedPerson) ",
  "recipient" : [" Reference(Device|Organization|Patient|Practitioner|RelatedPerson) "], 
  "payload" : [{ 
    "contentString" : "<string>",
    "contentAttachment" : " Attachment ",
    "contentReference" : " Reference(Any) "
  }],
  "medium" : [" CodeableConcept "], 
  "requester" : " Reference(Practitioner|Patient|RelatedPerson) ", 
  "status" : "<code>", 
  "encounter" : " Reference(Encounter) ", 
  "scheduledDateTime" : "<dateTime>",
  "scheduledPeriod" : " Period ",
  "reason" : [" CodeableConcept "], 
  "requestedOn" : "<dateTime>", 
  "subject" : " Reference(Patient) ", 
  "priority" : " CodeableConcept " 
}