The Claim That Was Filed on Time
A $3,410 claim for an outpatient surgical case is denied with CO-29, "the time limit for filing has expired." The practice's billing system shows the claim went out electronically 71 days after the date of service, inside the payer's 90-day clean-claim window. The clearinghouse file shows a 277CA acceptance with a payer-assigned claim control number on day 72. The payer's representative says the claim was never received and that the practice must resubmit. The patient has already called twice about the balance, and the account is at day 118 - past the payer's appeal window of 120 days from the denial, which arrived on day 96.
1. Should the practice resubmit as a new claim, appeal, or write off? Justify the decision using the facts given.
Read the worked answer
Appeal, and do it immediately.
Why not resubmit as new: a fresh claim carries the original date of service, so it will hit the same timely-filing edit and be denied again. Worse, resubmitting starts a new paper trail that makes it harder to prove the original submission date. The payer representative's instruction to 'just resubmit' is a verbal suggestion, not a documented resolution, and following it burns the remaining days.
Why not write off: the practice holds evidence of timely submission - the clearinghouse transmission date, the 277CA acceptance, and a payer-assigned claim control number. A payer-assigned number is strong evidence the file reached the payer's system. Writing off $3,410 without using that evidence is a preventable loss.
The appeal packet should contain:
- The 277CA acceptance report and transmission log.
- The payer-assigned claim control number and the date it was assigned.
- A short cover letter stating the submission date, the payer's stated receipt date, and the applicable filing limit.
- A request for a formal review of the payer's claim-receipt records.
Note the two clocks: the denial arrived day 96 and the appeal window closes day 120, leaving 24 days - not the 90-day window that applies to the original filing.
2. While the appeal is pending, what should happen to the patient's balance and to the account follow-up work?
Read the worked answer
The balance moves to patient-responsibility hold and the patient is not billed.
Patient status: the denial is a payer-provider dispute about administrative timeliness, not a patient liability issue. Until the appeal is resolved, the account should be flagged so statements stop and no collection activity occurs. The patient should be told plainly: 'Your insurance has denied this claim on a filing issue that we believe is their error. We are appealing it. You do not need to pay anything while that is in process.' Give a specific date for the next update.
Follow-up work:
- Set a tickler at 30 days; if no decision, escalate to the payer's provider relations representative.
- Log the denial reason code and outcome in the denial-tracking report so the pattern is visible - if CO-29 from this payer repeats, the root cause may be a clearinghouse-to-payer connectivity problem, not isolated claims.
- Confirm the clearinghouse still retains the original transaction, since evidence retention matters if the appeal is escalated.
- If the appeal is upheld, document the final determination before any balance is moved to the patient, and confirm whether the plan's own error means the member cannot be billed at all.
Billing the patient mid-appeal is the classic error here: it generates a complaint, often a refund, and undermines the appeal's premise that the patient owes nothing.