This is the ValueSet that contains all the codes in Non-Pack Semantic Drug Codes (http://hl7.org/fhir/us/davinci-drug-formulary/ValueSet/NonPackSemanticDrugVS) and Non-Pack Semantic Drug Codes (http://hl7.org/fhir/us/davinci-drug-formulary/ValueSet/NonPackSemanticDrugVS). E.g. what you have to deal with if you get resources containing codes in either of them