This is the ValueSet that contains all the codes in X12 Claim Adjustment Reason Codes - Remittance Advice Remark Codes (http://hl7.org/fhir/us/davinci-pdex/ValueSet/X12ClaimAdjustmentReasonCodesCMSRemittanceAdviceRemarkCodes) and X12 Claim Adjustment Reason Codes - Remittance Advice Remark Codes (http://hl7.org/fhir/us/davinci-pdex/ValueSet/X12ClaimAdjustmentReasonCodesCMSRemittanceAdviceRemarkCodes). E.g. what you have to deal with if you get resources containing codes in either of them