CO-164
Attachment/other documentation referenced on the claim was not received in a timely fashion
What This Code Means
The supporting documentation was received, but after the payer’s required deadline.
Common Causes
- Documentation gathered and sent later than the payer's response window
- Internal routing delay for medical records requests
How to Resolve or Appeal
- Track payer documentation deadlines closely once a request is received
- Appeal if there's a legitimate reason for the delay, with proof of when it was actually available
Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.