How do I resolve a CO-29 denial?

Verify actual date of service and claim submission date in your practice management system: Confirm whether the claim truly exceeded the contractual filing limit specified in your payer contract Determine if qualifying extenuating circumstances exist for late filing: Valid reasons include payer system outages, retroactive eligibility changes, delayed coordination of benefits information, or documented prior payer correspondence causing delays Submit a timely filing appeal with documented evidence of extenuating circumstances within the payer's appeal timeframe: Include proof of timely intent (transmission reports, prior correspondence) or evidence that filing delay was beyond provider control If appeal is denied, write off the balance and update billing procedures to prevent future timely filing violations: Patient cannot be billed per contractual obligation; implement claim scrubbing and aging reports to catch filing deadline risks earlier

835 Denial Combination

CO-29

Contractual Obligation · Claim-Level Adjustment

Timely Filing

What This Combination Means

This claim was denied because it was submitted after the payer's contractual timely filing deadline. The provider is contractually obligated to write off the entire denied amount and cannot balance bill the patient, even though the denial resulted from a provider-side filing error.

Financial Responsibility

provider writeoff

The provider must absorb the full cost of services rendered. Contractual terms prevent patient billing for late-filed claims, regardless of patient benefit eligibility.

N/A

Appeal Success

30-60 days (appeal process)

Avg. Resolution

Hard

Difficulty

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-29 combination — not generic advice.

Not Appealable:Timely filing limits are contractual deadlines. Once the filing window has closed, this denial is not appealable unless the provider can demonstrate a valid exception (e.g., payer error, force majeure). Standard appeals are not accepted.

1
Verify actual date of service and claim submission date in your practice management system
Confirm whether the claim truly exceeded the contractual filing limit specified in your payer contract
2
Determine if qualifying extenuating circumstances exist for late filing
Valid reasons include payer system outages, retroactive eligibility changes, delayed coordination of benefits information, or documented prior payer correspondence causing delays
3
Submit a timely filing appeal with documented evidence of extenuating circumstances within the payer's appeal timeframe
Include proof of timely intent (transmission reports, prior correspondence) or evidence that filing delay was beyond provider control
4
If appeal is denied, write off the balance and update billing procedures to prevent future timely filing violations
Patient cannot be billed per contractual obligation; implement claim scrubbing and aging reports to catch filing deadline risks earlier

Specialty Context

How CO-29 typically presents across different practice types.

Dental

Verify timely filing limits in dental contracts, which often range from 90 days to 1 year from date of service; orthodontic claims with multiple service dates require careful tracking

Medical

Hospital claims may have different timely filing limits than professional claims; coordinate benefits situations and retroactive eligibility changes are common appeal justifications

Behavioral Health

Ongoing treatment episodes and authorization delays can complicate timely filing; document all communications regarding authorization or eligibility verification that may have caused submission delays

Individual Code References

View the standalone definition for each code in this combination.

CARC 29

Medicare Contractor Guidance for CARC 29

Noridian + uhc + aetna + bcbs_az

The time limit for filing has expired. Claims must be filed within one year of the date of service. If an act of nature, such as a flood, fire, or there are other circumstances outside of the supplier's control, you can appeal the timely filing, by providing this explanation.

How to Prevent CARC 29 Denials

✓
Review the date of service prior to submitting the claim. All claims must be filed within one year of the date of service.
✓
Reopenings must be submitted one year from initial determination date or after one year from receipt date due to overpayment via clerical error omissions

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Synthesized from official definitions — not from training data

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