This is the CodeSystem that contains all the codes in MeasureDataUsage (http://terminology.hl7.org/CodeSystem/measure-data-usage) and MeasureDataUsage (http://terminology.hl7.org/CodeSystem/measure-data-usage). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 4c05a9f5-c5c6-415b-bc13-3335b255c8a0-554
This code system http://hl7.org/fhir/comparison/CodeSystem/4c05a9f5-c5c6-415b-bc13-3335b255c8a0-554 defines codes, but no codes are represented here