This is the ValueSet that contains all the codes in Coding Gap Remark (http://hl7.org/fhir/us/davinci-ra/ValueSet/coding-gap-remark) and Coding Gap Remark (http://hl7.org/fhir/us/davinci-ra/ValueSet/coding-gap-remark). E.g. what you have to deal with if you get resources containing codes in either of them