This is the CodeSystem that contains all the codes in Claim Norm Code (https://www.ehealth.fgov.be/standards/fhir/nihdi-terminology/CodeSystem/be-cs-claim-norm-code) and Claim Norm Code (https://www.ehealth.fgov.be/standards/fhir/nihdi-terminology/CodeSystem/be-cs-claim-norm-code). E.g. what you have to deal with if you get resources containing codes in either of them