Category: Denial Codes

CO 109 Denial Code

CO 109 Denial Code Explained – Causes, Filing Rules & Prevention

In the complex world of medical billing, claim denials can significantly impact a provider’s cash flow, operational efficiency, and financial stability. One of the most common and often misunderstood denial codes is CO 109. This denial typically arises due to timely filing issues, which means the payer received the claim after the allowed submission deadline. […]
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co 197 Denial Code

Complete Guide to Handling CO‑197 Denials in Medical Billing

What is CO‑197? In medical claims terminology, CO 197 (or “CO‑197”) is a denial adjustment code used by payers to indicate that a claim (or line item) was rejected because precertification, authorization, or required notification was not obtained prior to providing the service. The “CO” stands for Contractual Obligation — meaning this denial is tied […]
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