An occurrence of information being transmitted; e.g. an alert that was sent to a responsible provider, a public health agency was notified about a reportable condition.

Identifiers associated with this Communication that are defined by business processes and/ or used to refer to it when a direct URL reference to the resource itself is not appropriate (e.g. in CDA documents, or in written / printed documentation).

An order, proposal or plan fulfilled in whole or in part by this Communication.

This must point to some sort of a 'Request' resource, such as CarePlan, CommunicationRequest, ReferralRequest, MedicationOrder, etc.

Part of this action.

This must point to some sort of an 'Event' resource such as Communication, Procedure, MedicationAdministration, etc.

The status of the transmission.

The type of message conveyed such as alert, notification, reminder, instruction, etc.

A channel that was used for this communication (e.g. email, fax).

The patient who was the focus of this communication.

The resources which were responsible for or related to producing this communication.

The encounter within which the communication was sent.

The time when this communication was sent.

The time when this communication arrived at the destination.

The entity (e.g. person, organization, clinical information system, or device) which was the source of the communication.

The entity (e.g. person, organization, clinical information system, or device) which was the target of the communication. If receipts need to be tracked by individual, a separate resource instance will need to be created for each recipient.  Multiple recipient communications are intended where either a receipt(s) is not tracked (e.g. a mass mail-out) or is captured in aggregate (all emails confirmed received by a particular time).

The reason or justification for the communication.

Text, attachment(s), or resource(s) that was communicated to the recipient.

A communicated content (or for multi-part communications, one portion of the communication).

Additional notes or commentary about the communication by the sender, receiver or other interested parties.