CO-284Contractual ObligationAuthorization
CO-284 Denial Code: Auth number valid but not for these services
The authorization exists but doesn't cover the billed services — wrong codes, levels, or scope on the auth.
Why CO-284 happens
- ●Procedure changed intraoperatively without auth update
- ●Auth obtained for different CPT codes than performed/billed
How to fix a CO-284 denial
- 1
Request an auth amendment/retro-review matching actual services; appeal with clinical rationale for the change
How to prevent it
Post-procedure auth reconciliation before claims release for surgical cases.
Drowning in CO-284 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.