This is the ValueSet that contains all the codes in SNOMED CT Medication As Needed Reason Codes (http://hl7.org/fhir/ValueSet/medication-as-needed-reason) and SNOMED CT Medication As Needed Reason Codes (http://hl7.org/fhir/ValueSet/medication-as-needed-reason). E.g. what you have to deal with if you get resources containing codes in either of them