RARC

A Remittance Advice Remark Code (RARC) supplements a CARC with additional detail about why a claim was adjusted or denied. RARCs are also published by WPC and begin with 'N' (informational) or 'M' (supplemental) or other prefixes. CO-16 (missing information) always arrives with a RARC specifying exactly what field is missing — identifying the RARC is the first step to correcting the claim.