CO-135Contractual ObligationCoding
CO-135 Denial Code: Interim bills cannot be processed
The payer doesn't accept interim billing for this stay/plan — it wants a single final claim.
Why CO-135 happens
- ●Interim TOB frequency (XX2/XX3) submitted to a payer that requires discharge billing
How to fix a CO-135 denial
- 1
Hold and combine into a final bill at discharge; void interim submissions
How to prevent it
Configure interim-billing eligibility per payer in patient accounting.
Drowning in CO-135 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.