Denial Code Library

Posts

What every insurance denial code means — and exactly how to fight back against each one.

Denial Code B15 — Missing or Invalid Authorization — What It Means and What to Do

Denial Code B15 means an authorization number was missing or wrong. Usually correctable at the billing level if you act fast.

Alex Rivera

June 24, 2026

Denial Code Library

Denial Code CO-16 — Claim Lacks Information — How to Correct and Resubmit

| Denial Code CO-16 means missing information. One of the most correctable denials — often fixed by resubmission alone.

Alex Rivera

June 25, 2026

Denial Code Library

Denial Code CO-29 — Timely Filing Limit Exceeded — Can You Still Appeal?

Denial Code CO-29 is a timely filing denial. Hard to overturn — but exceptions exist when you have proof you filed on time,

Alex Rivera

June 25, 2026

Denial Code Library

Denial Code CO-167 — Diagnosis Inconsistent with Procedure — How to Appeal

Denial Code CO-167 means diagnosis inconsistent with procedure. Usually a documentation gap — here is how to fix and appeal it.

Alex Rivera

July 20, 2026

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