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CO-20 - Denial Journal
CARC CO — Contractual Obligation

CO-20

This injury/illness is covered by the liability carrier

What This Code Means

The payer believes a liability insurer (e.g. auto or general liability) is responsible for this claim.

Common Causes

  • Diagnosis suggests an accident or injury with a liable third party
  • Liability claim information not on file with the payer

How to Resolve or Appeal

  1. Confirm whether a liability claim exists (e.g. auto accident)
  2. Bill the liability carrier if applicable, or appeal with clarification if not

Related Codes

CO-21

More Denial Codes to Check

RARC MA89 CARC CO-109 Claim not covered by this payer/contractor — send to correct payer RARC N36 RARC MA04 Secondary payment cannot be considered without primary payer's identity/payment info RARC MA83 RARC MA17 CARC CO-22 This care may be covered by another payer per coordination of benefits RARC N8 CARC CO-A3 RARC MA87

Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.

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