Guides and Articles

The CO-29 denial ("Time limit for filing has expired") is the most common reason for write-offs. Learn how to use Clearinghouse logs to prove timely filing and recover this revenue. CO-29 Of all the denial codes a biller sees on an Explanation of Benefits (EOB), CO-29  is the most frustrating. The Definition:   CO-29: The time limit for filing has expired. Unlike a coding error (CO-11) or a medical necessity denial (CO-50), a CO-29 denial admits that you were right—you just w