This is the ValueSet that contains all the codes in SNOMED CT Drugs not taken/completed Codes (http://hl7.org/fhir/ValueSet/reason-medication-not-taken-codes) and SNOMED CT Drugs not taken/completed Codes (http://hl7.org/fhir/ValueSet/reason-medication-not-taken-codes). E.g. what you have to deal with if you get resources containing codes in either of them