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

The Complete Insurance Denial Code Library — What Every Code Means

The ClaimCompass Denial Code Library translates every major insurance denial code and tells you exactly what to do.

Alex Rivera

July 11, 2026

Denial Code Library

Denial Code CO-109 — Claim Not Covered by This Payer — What It Means and Next Steps

Denial Code CO-109 means the claim wasn't covered by this payer. Eligibility errors and wrong submissions are common causes.

Alex Rivera

June 24, 2026

Denial Code Library

Denial Code CO-58 — Treatment Not Covered by This Payer — How to Respond

Denial Code CO-58 means the service isn't covered — but exclusions must be explicit in your plan documents to hold up.

Alex Rivera

June 25, 2026

Denial Code Library

Denial Code OA-23 — Coordination of Benefits — How to Navigate It

Denial Code OA-23 involves two insurance plans. Submit to the primary insurer first — here is how coordination of benefit works.

Alex Rivera

June 25, 2026

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