CO-189
'Not otherwise classified' or 'unlisted' code billed when a specific code exists
What This Code Means
An unlisted/NOC procedure code was used even though a more specific code exists for the service performed.
Common Causes
- Coder defaulted to an unlisted code out of habit or uncertainty
- Newer specific code not yet added to the practice's charge master
How to Resolve or Appeal
- Identify and use the correct, more specific CPT/HCPCS code
- Update the charge master to prevent recurrence
More Denial Codes to Check
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.