This is the CodeSystem that contains all the codes in DefinitionTopic (http://terminology.hl7.org/CodeSystem/definition-topic) and DefinitionTopic (http://terminology.hl7.org/CodeSystem/definition-topic). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 07b973d6-97cd-42d7-b76a-7b2793e3363b-317
This code system http://hl7.org/fhir/comparison/CodeSystem/07b973d6-97cd-42d7-b76a-7b2793e3363b-317 defines codes, but no codes are represented here