The time limit for filing has expired.
The claim was submitted after the payer filing deadline. Most payers will permanently deny claims submitted past their window.
What This Means in Practice
Timely filing denials are often permanent revenue loss. Without proof of timely original submission, recovery is near zero. Prevention and tracking are critical.
Common Root Causes
- →Claim submitted to wrong payer — corrected resubmission missed deadline
- →Internal billing delays (charge lag, coding queue backlog)
- →Claim rejected by clearinghouse and not corrected in time
- →Paper claim lost in mail with no delivery confirmation
Common Billing Mistakes
- ✗Not tracking timely filing deadlines by payer
- ✗Not retaining clearinghouse submission confirmations
- ✗Not reviewing rejected claims daily
- ✗Assuming all payers have the same filing deadline
Documentation Required
Considerations
Modifier
Not applicable to CO-29.
Medical Necessity
Not applicable to CO-29.
Prior Authorization
Not applicable to CO-29.
Eligibility
If the patient coverage was retroactive, the timely filing clock may be extended. Check for retroactive enrollment.
Coordination of Benefits
If denied by the primary for timely filing, the secondary may also deny. Bill the primary first and track deadlines.
Timely Filing
CO-29 IS the timely filing denial. Medicare: 12 months from DOS. Commercial: typically 90-180 days. Medicaid: varies by state.
Appeal & Resolution Strategy
Appeal with proof of timely submission (clearinghouse confirmation, certified mail receipt). Without proof, appeals rarely succeed.
Related CPT Scenarios
- ▸Any CPT code submitted past the payer filing deadline
ICD-10 Considerations
Not applicable.
Related Payer Policy Guidance
Medicare
Medicare requires claims within 12 months (1 year) from the date of service.
Commercial
Commercial payers typically require 90-180 days. Check each payer contract.
Medicaid
Medicaid deadlines vary by state — typically 90-365 days.
Related Resources
Knowledge Center Articles
Academy Lessons
Similar & Related Codes
Disclaimer: Code definitions and payer policies change. Always verify current definitions against CMS, X12, and payer-specific guidance. This information is for educational purposes only.