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 c5235383-6fe4-49cb-8193-cf88e1d9083e-554
This code system http://hl7.org/fhir/comparison/CodeSystem/c5235383-6fe4-49cb-8193-cf88e1d9083e-554 defines codes, but no codes are represented here