This is the ValueSet that contains all the codes in CRD Coverage Information Documentation Reason Value Set (http://hl7.org/fhir/us/davinci-crd/ValueSet/DocReason) and CRD Coverage Information Documentation Reason Value Set (http://hl7.org/fhir/us/davinci-crd/ValueSet/DocReason). E.g. what you have to deal with if you get resources containing codes in either of them