CO-15
What This Code Means
The authorization number is missing, invalid, or does not apply to the billed services or provider. This code was deactivated by X12 (as of 05/01/2018).
How to Resolve or Appeal
- This is a historical/deactivated code — no longer used on current claims. If seen on an old remittance, refer to the replacement code noted above where available.
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.