This code system http://terminology.hl7.org/CodeSystem/communication-topic defines the following codes:

CodeDisplayDefinition
prescription-refill-request Prescription Refill RequestThe purpose or content of the communication is a prescription refill request.
progress-update Progress UpdateThe purpose or content of the communication is a progress update.
report-labs Report LabsThe purpose or content of the communication is to report labs.
appointment-reminder Appointment ReminderThe purpose or content of the communication is an appointment reminder.
phone-consult Phone ConsultThe purpose or content of the communication is a phone consult.
summary-report Summary ReportThe purpose or content of the communication is a summary report.
 <status value="draft"/> <experimental value="false"/> <date value="2020-04-09T21:10:28+00:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="Codes describing the purpose or content of the communication."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/communication-topic"/> <content value="complete"/> <concept> <code value="prescription-refill-request"/> <display value="Prescription Refill Request"/> <definition value="The purpose or content of the communication is a prescription refill request."/> </concept> <concept> <code value="progress-update"/> <display value="Progress Update"/> <definition value="The purpose or content of the communication is a progress update."/> </concept> <concept> <code value="report-labs"/> <display value="Report Labs"/> <definition value="The purpose or content of the communication is to report labs."/> </concept> <concept> <code value="appointment-reminder"/> <display value="Appointment Reminder"/> <definition value="The purpose or content of the communication is an appointment reminder."/> </concept> <concept> <code value="phone-consult"/> <display value="Phone Consult"/> <definition value="The purpose or content of the communication is a phone consult."/> </concept> <concept> <code value="summary-report"/> <display value="Summary Report"/> <definition value="The purpose or content of the communication is a summary report."/> </concept> </CodeSystem>