CO-234: Procedure not paid separately
UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE
The payer treats this procedure as part of another service on the claim. Like CO-97, a bundling rule.
CO-234 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-234 denial
- The billing office reviews whether a modifier legitimately separates the services and rebills if so.
- You generally owe nothing extra for bundled write-offs in-network.
Denied? Don’t drop it
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