Denial Code Library

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

Denial Code Library

Denial Code CO-97 — Bundling and Unbundling — What It Means and How to Challenge It

Denial Code CO-97 is a bundling denial. Often correctable with the right billing modifier. Here is how to challenge it.

Alex Rivera

June 24, 2026

Denial Code Library

Denial Code CO-4 — Prior Authorization Required — How to Appeal

Denial Code CO-4 means prior authorization was missing. Retroactive auth and emergency exceptions can still save your claim.

Alex Rivera

June 25, 2026

Denial Code Library

Denial Code PR-96 — What It Means and How to Dispute It

Denial Code PR-96 | PR-96 means non-covered charge, but exclusions must be explicit in your plan. Here is when and how to dispute

Alex Rivera

June 25, 2026

Denial Code Library

What Is Denial Code CO-50 — and How Do You Beat It?

Denial code CO-50 means "not medically necessary" — the most common health insurance denial. Here is how to beat it.

Alex Rivera

June 24, 2026

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