This is the CodeSystem that contains all the codes in expansion parameter source code system (http://hl7.org/fhir/expansion-parameter-source) and expansion parameter source code system (http://hl7.org/fhir/expansion-parameter-source). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 92431a97-3e94-42a2-9831-10d76a2d19f8-29
This code system http://hl7.org/fhir/comparison/CodeSystem/92431a97-3e94-42a2-9831-10d76a2d19f8-29 defines codes, but no codes are represented here