Union of http://hl7.org/fhir/sid/icpc-1-nl and http://hl7.org/fhir/sid/icpc-1-nl
This is the CodeSystem that contains all the codes in ICPC-1 NL (http://hl7.org/fhir/sid/icpc-1-nl) and ICPC-1 NL (http://hl7.org/fhir/sid/icpc-1-nl). E.g. what you have to deal with if you get resources containing codes in either of them