This is the CodeSystem that contains all the codes in pan-Canadian LOINC Observation Code Database (https://fhir.infoway-inforoute.ca/CodeSystem/pCLOCD) and pan-Canadian LOINC Observation Code Database (https://fhir.infoway-inforoute.ca/CodeSystem/pCLOCD). E.g. what you have to deal with if you get resources containing codes in either of them