CO-116Contractual ObligationDocumentation
CO-116 Denial Code: Advance notice (ABN) non-compliant
The advance beneficiary notice you relied on didn't meet requirements — wrong form, missing elements, or signed after the fact — so liability shifts to the provider.
Why CO-116 happens
- ●Outdated ABN form version used
- ●ABN signed after the service or missing cost estimates
- ●Blanket ABNs used where item-specific notice is required
How to fix a CO-116 denial
- 1
Appeal only if you can show a compliant notice; otherwise write off — the patient cannot be billed
How to prevent it
Use the current CMS ABN form, complete every field, and obtain signatures before service.
Drowning in CO-116 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.