Timely Filing Denial After Clearinghouse Rejection
On January 10, a provider saw a 45-year-old patient with commercial insurance. The claim was submitted electronically to the payer on March 30, which was day 79 of the payer's 90-day timely filing limit. The clearinghouse rejected the claim on April 2 because the billing NPI was entered as a group NPI instead of the rendering provider's individual NPI. The biller corrected the NPI and resubmitted on April 12, and the payer received the claim on April 14. The payer denied the claim with CO-29, stating the filing limit expired. The payer's denial is dated May 20, and the appeal deadline is 60 days from the denial date. The practice has the clearinghouse rejection report showing the original March 30 submission and the April 2 rejection. The charge is $420. The patient has not been billed. The biller wants to write off the claim because the payer's denial is final. The provider asks whether to appeal and what to do if the appeal fails.
1. Is the CO-29 denial appealable? What evidence supports the appeal?
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The CO-29 denial is appealable because the original electronic claim was submitted on March 30, day 79 of the 90-day limit, and the clearinghouse rejected it on April 2 for a technical NPI error, not because the payer received a late claim. The appeal should include the clearinghouse rejection report showing the March 30 submission and April 2 rejection, the original 837P file or acceptance report, the corrected claim, the payer's EOB, and a letter explaining that the resubmission was a correction of a clearinghouse rejection. The practice should ask the payer to honor the original submission date as proof of timely filing. The NPI error was internal, but it occurred before payer receipt and within the filing window.
2. What is the appeal deadline, and what should the practice do if the payer upholds the denial?
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The denial is dated May 20, and the appeal deadline is 60 days, so the appeal must be filed by July 19. Count May 21-31 as 11 days, June adds 30 (41), and July 19 is day 60. Submit the appeal with proof of timely filing before the deadline and keep the electronic tracking confirmation. If the payer upholds the denial, file a second-level appeal or grievance if the plan allows, citing the clearinghouse record. If all appeals fail, write off the $420 as a provider adjustment; do not bill the patient, because the late filing resulted from the practice's NPI submission error. Update the NPI edit and clearinghouse workflow to prevent recurrence.
3. Can the practice bill the patient the $420 if the appeal fails? Explain.
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No. The $420 should not be billed to the patient. Timely filing is a provider responsibility, and the delay was caused by the practice submitting the wrong NPI, not by the patient. Billing the patient for a claim the practice failed to file correctly could violate the payer contract and state billing rules, and it is not a patient responsibility. The only exception would be if the patient's own action caused the delay, which is not the case here. The practice should absorb the loss, document the root cause, and correct its clearinghouse edits so rendering-provider NPI errors are caught before submission.