This is the ValueSet that contains all the codes in Diflunisal Medications Value Set (http://hl7.org/fhir/uv/pddi/ValueSet/valueset-diflunisal) and Diflunisal Medications Value Set (http://hl7.org/fhir/uv/pddi/ValueSet/valueset-diflunisal). E.g. what you have to deal with if you get resources containing codes in either of them