CO-27Contractual ObligationEligibility
CO-27 Denial Code: Expenses incurred after coverage terminated
Expenses were incurred after the patient's insurance coverage terminated.
Why CO-27 happens
- ●Policy termed before the date of service
- ●Employer group coverage ended (job change) without patient notice
- ●Eligibility checked against an old plan
How to fix a CO-27 denial
- 1
Re-verify eligibility for the exact date of service
- 2
Ask the patient for current insurance and bill the active plan
- 3
If no active coverage, transfer balance to patient with a clear statement
How to prevent it
Run real-time eligibility (270/271) at scheduling and again at check-in.
Drowning in CO-27 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.