CO-198
Precertification/notification/authorization/pre-treatment exceeded
What This Code Means
The service exceeded the scope, units, or date range of the authorization that was actually obtained.
Common Causes
- More units/visits performed than the authorization allowed
- Service performed after the authorization's approved date range expired
How to Resolve or Appeal
- Compare units/dates billed against the approved authorization exactly
- Request an authorization extension or additional units if clinically justified, and appeal with that documentation
More Denial Codes to Check
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.