This is the ValueSet that contains all the codes in Medicine Codes (https://nrces.in/ndhm/fhir/r4/ValueSet/ndhm-medicine-codes) and Medicine Codes (https://nrces.in/ndhm/fhir/r4/ValueSet/ndhm-medicine-codes). E.g. what you have to deal with if you get resources containing codes in either of them