This is the ValueSet that contains all the codes in NUBC Present On Admission Indicator Codes Value Set (http://hl7.org/fhir/us/carin-bb/ValueSet/AHANUBCPresentOnAdmission) and CMS Present On Admission Indicator Codes Value Set (http://hl7.org/fhir/us/carin-bb/ValueSet/CMSPresentOnAdmissionIndicator). E.g. what you have to deal with if you get resources containing codes in either of them