CO-251Contractual ObligationDocumentation
CO-251 Denial Code: Attachment incomplete/deficient
The documentation received was incomplete — the payer still lacks what it needs to adjudicate.
Why CO-251 happens
- ●Missing pages, unsigned notes, or absent required elements in submitted records
How to fix a CO-251 denial
- 1
Cure the specific deficiency (signature, missing report) and resubmit documentation promptly
How to prevent it
Pre-submission documentation checklists for records responses.
Drowning in CO-251 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.