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