This is the ValueSet that contains all the codes in Quality Benchmark Terminology (http://hl7.org/fhir/us/pq-cmc-fda/ValueSet/pqcmc-quality-benchmark-terminology) and Quality Benchmark Terminology (http://hl7.org/fhir/us/pq-cmc-fda/ValueSet/pqcmc-quality-benchmark-terminology). E.g. what you have to deal with if you get resources containing codes in either of them