This is the CodeSystem that contains all the codes in Device Metric Category (http://terminology.hl7.org/CodeSystem/metric-category) and Device Metric Category (http://terminology.hl7.org/CodeSystem/metric-category). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 0fe243fb-0325-42eb-9949-7980a81f5112-686
This code system http://hl7.org/fhir/comparison/CodeSystem/0fe243fb-0325-42eb-9949-7980a81f5112-686 defines codes, but no codes are represented here