This is the CodeSystem that contains all the codes in CommunicationCategory (http://terminology.hl7.org/CodeSystem/communication-category) and CommunicationCategory (http://terminology.hl7.org/CodeSystem/communication-category). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 59c72e56-3fd0-4edc-84da-7064a6bf4fbf-740
This code system http://hl7.org/fhir/comparison/CodeSystem/59c72e56-3fd0-4edc-84da-7064a6bf4fbf-740
defines codes, but no codes are represented here