This is the ValueSet that contains all the codes in X12 278 Reject Reason Value Set (http://hl7.org/fhir/us/davinci-pas/ValueSet/X12278RejectReasonCodes) and X12 278 Reject Reason Value Set (http://hl7.org/fhir/us/davinci-pas/ValueSet/X12278RejectReasonCodes). E.g. what you have to deal with if you get resources containing codes in either of them