CMS 2026 Alert: Quarterly ICD-10-CM & NCCI updates active.
About Us Editorial Policy Contact RCM Team
🔍 Quick Search
CO-21 - Denial Journal
CARC CO — Contractual Obligation

CO-21

This injury/illness is the liability of the no-fault carrier

What This Code Means

The payer believes a no-fault auto insurance carrier is responsible for this claim.

Common Causes

  • Diagnosis/documentation suggests a motor vehicle accident
  • No-fault claim information missing from the payer's file

How to Resolve or Appeal

  1. Confirm whether a no-fault auto claim exists for this patient
  2. Bill the no-fault carrier if applicable, or appeal with clarification

Related Codes

CO-20

More Denial Codes to Check

CARC OA-23 Impact of prior payer(s) adjudication including payments and/or adjustments CARC CO-20 This injury/illness is covered by the liability carrier RARC MA89 RARC MA99 RARC MA17 CARC CO-19 Work-related injury/illness — liability of the Workers' Compensation carrier RARC N8 RARC MA04 Secondary payment cannot be considered without primary payer's identity/payment info CARC CO-109 Claim not covered by this payer/contractor — send to correct payer CARC CO-99 RARC MA88 CARC CO-22 This care may be covered by another payer per coordination of benefits CARC CO-A3

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

🏠 Home 🔍 Lookup 📋 Appeals 📖 Guides
Scroll to Top