This is the CodeSystem that contains all the codes in ActivityDefinitionCategory (http://terminology.hl7.org/CodeSystem/activity-definition-category) and ActivityDefinitionCategory (http://terminology.hl7.org/CodeSystem/activity-definition-category). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem d53e329c-e887-45ef-9643-5105cec80626-23
This code system http://hl7.org/fhir/comparison/CodeSystem/d53e329c-e887-45ef-9643-5105cec80626-23 defines codes, but no codes are represented here