RARC (Remittance Advice Remark Code)
A RARC is a supplemental code on the remit that adds detail a CARC alone doesn't — often the specific missing element or policy behind a denial.
A RARC (remittance advice remark code) is a secondary code that accompanies a CARC to add the detail the CARC leaves out. Where a CARC tells you the category of a reduction, the RARC often tells you the specific reason: CO-16 ('claim lacks information') is nearly useless on its own, but the RARC paired with it points to the exact missing element — a member ID, an NPI, a modifier, an authorization number. RARCs come in two flavors: supplemental codes (starting with 'M' or 'N', or newer alphanumeric codes) that explain, and informational codes (starting with 'Alert:') that just notify. For a billing office, the RARC is what turns a vague denial into an actionable fix — it's the difference between 'something's missing' and 'the rendering NPI didn't match our records.' Reading the CARC and RARC together is essential: the CARC sets the strategy (appeal, correct and resubmit, or write off) and the RARC usually tells you precisely what to fix or prove. Skipping the RARC is how easily-correctable denials get written off, because the practice never saw the one line that said what the payer actually wanted.
Volari reads the RARC alongside the CARC, so a generic CO-16 becomes a specific correction — the exact element to fix and resubmit rather than a denial that stalls.
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