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