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 ceaac9ad-f8a4-45dd-ac3b-287f763986d9-1211
This code system http://hl7.org/fhir/comparison/CodeSystem/ceaac9ad-f8a4-45dd-ac3b-287f763986d9-1211 defines codes, but no codes are represented here