This is the ValueSet that contains all the codes in Body Site (https://www.ehealth.fgov.be/standards/fhir/core-clinical/ValueSet/be-vs-bodysite) and Body Site (https://www.ehealth.fgov.be/standards/fhir/terminology/ValueSet/be-vs-bodysite). E.g. what you have to deal with if you get resources containing codes in either of them