CO-109: Claim not covered by this payer — submit elsewhere
UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE
The claim went to the wrong payer or the wrong contractor (common with plan changes, or Medicare vs. Medicare Advantage confusion).
CO-109 at a glance
- Code group: CO — Contractual Obligation — in-network providers generally cannot bill you for CO adjustments.
- Who usually fixes it: The provider’s billing office.
- Worth appealing? Rarely — usually fixed by resubmission.
What to do about a CO-109 denial
- Confirm which insurer was active on the date of service and tell the billing office.
- The office resubmits to the correct payer; the wrong-payer denial itself needs no appeal.
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