This is the ValueSet that contains all the codes in KV Fachgruppe (https://fhir.cognovis.de/praxis/ValueSet/kv-fachgruppe-vs) and KV Fachgruppe (https://fhir.cognovis.de/praxis/ValueSet/kv-fachgruppe-vs). E.g. what you have to deal with if you get resources containing codes in either of them