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