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 42938729-f0f2-4a37-ad47-10b7c7bad89b-554
This code system http://hl7.org/fhir/comparison/CodeSystem/42938729-f0f2-4a37-ad47-10b7c7bad89b-554 defines codes, but no codes are represented here