This is the ValueSet that contains all the codes in CMS Place of Service Codes (POS) Value Set (http://hl7.org/fhir/us/carin-bb/ValueSet/CMSPlaceofServiceCodes) and CMS Place of Service Codes (POS) Value Set (http://hl7.org/fhir/us/carin-bb/ValueSet/CMSPlaceofServiceCodes). E.g. what you have to deal with if you get resources containing codes in either of them