This is the ValueSet that contains all the codes in JDV_J257_Region (https://mos.esante.gouv.fr/NOS/JDV_J257-Region/FHIR/JDV-J257-Region) and JDV_J257_Region (https://mos.esante.gouv.fr/NOS/JDV_J257-Region/FHIR/JDV-J257-Region). E.g. what you have to deal with if you get resources containing codes in either of them