Health Care Payment and Remittance Advice and Electronic Funds …
https://www.hhs.gov/guidance/document/health-care-payment-and-remittance-advice-and-electronic-funds-transfer-0
WEBAug 2, 2020 · Under HIPAA, all payers, including Medicare, are required to use claims adjustment reason codes (CARCs) and remittance advice remark codes (RARCs) approved by X12 recognized code set maintainers. Payers are not allowed to use their own proprietary codes to explain any adjustment in the claim payment.
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