What does CARC 16 mean?

CARC 16 means 'Claim/service lacks information or has submission/billing error(s).' It's the most common CARC and is always paired with a RARC that specifies exactly what's missing or invalid.

Why is CARC 16 so common?

CARC 16 is a catch-all denial used when any required field is missing, incomplete, or invalid. Any of 100+ different data fields can trigger it, which is why it shows up across specialties and payers.

How do I know what's missing on a CARC 16?

Always read the RARC that accompanies CARC 16. The RARC identifies the specific missing data element. Without the RARC, you're guessing.

CARC 16: Missing or Incomplete Claim Information

Official CMS Definition

"Claim/service lacks information or has submission/billing error(s)."

Group Code: CO or PI Category: Missing Info Risk Level: Medium Appealable: Yes

What CARC 16 Actually Means

Claim Adjustment Reason Code (CARC) 16 is one of the most common denial codes in medical billing, and one of the most fixable. It means the payer received a claim that is missing required information, contains incomplete data, or has a submission error that prevents adjudication. The payer is not saying the service isn't covered. They're saying they can't process the claim as submitted.

The critical thing to understand about CARC 16 is that it almost always comes paired with a RARC code. That RARC tells you exactly what is missing. Most billing teams fix the wrong thing because they look at the CARC and not the RARC.

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