This is the ValueSet that contains all the codes in MDC Unit of Measurement (http://hl7.org/fhir/uv/pocd/ValueSet/11073MDC-dimension) and MDC Unit of Measurement (http://hl7.org/fhir/uv/pocd/ValueSet/11073MDC-dimension). E.g. what you have to deal with if you get resources containing codes in either of them