CO-B15: Required qualifying service/procedure missing
UPDATED JULY 2026 · U.S. PLANS · NOT LEGAL OR MEDICAL ADVICE
The payer expected a linked service (e.g., a primary procedure) that doesn't appear on this or a related claim.
CO-B15 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-B15 denial
- The billing office checks whether the qualifying service was performed and billed correctly, then resubmits.
- If the qualifying-service rule itself is the obstacle to needed care, ask about an exception with clinical support.
Denied? Don’t drop it
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