This is the ValueSet that contains all the codes in FR Core ValueSet Identity method collection (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-identity-method-collection) and FR Core ValueSet Identity method collection (https://hl7.fr/ig/fhir/core/ValueSet/fr-core-vs-identity-method-collection). E.g. what you have to deal with if you get resources containing codes in either of them