CO-22: Care may be covered by another payer (coordination of benefits)
UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE
The payer thinks another insurer should pay first — common after job changes, with two working spouses, or after accidents. The claim is parked until coordination of benefits is updated.
CO-22 at a glance
- Code group: CO — Contractual Obligation — in-network providers generally cannot bill you for CO adjustments.
- Who usually fixes it: You and the billing office together.
- Worth appealing? Sometimes — depends on the facts.
What to do about a CO-22 denial
- Call your insurer and update your coordination-of-benefits information (they usually just need a short questionnaire).
- Ask the other insurer (if any) to process first, then have the claim resubmitted with that outcome.
- If there is no other coverage, say so — the claim should then process normally.
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