CO-21Contractual ObligationCoordination of Benefits
CO-21 Denial Code: Injury covered by no-fault carrier
This injury/illness is the liability of the no-fault carrier.
Why CO-21 happens
- ●Auto-accident injury in a no-fault state billed to the health plan
How to fix a CO-21 denial
- 1
Obtain the auto/no-fault carrier and claim number
- 2
Bill the no-fault carrier first; health plan after exhaustion
How to prevent it
Ask about accident involvement for relevant diagnoses at intake.
Drowning in CO-21 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.