Old Claims Become Uncollectible After Filing Deadlines
- Sirius solutions global
- Mar 24
- 7 min read
One Missed Deadline. Permanent Revenue Loss. Not "at risk." Not "in jeopardy." Gone, the moment the timely filing window closes, the money disappears permanently. No appeal. No correction. No second chance. The care was real, the documentation exists, and the payer will not touch it.
Most practices discover this the wrong way.
A billing staff member pulls the AR report and notices a cluster of commercial claims from four months ago. She calls the payer. The rep confirms: timely filing exceeded, claim denied, no exception. She checks the next payer. Same answer. By the end of the day, she had identified $31,000 in claims that cannot be appealed, cannot be resubmitted, and cannot be collected ever.
That is not a billing error. That is a workflow failure with a permanent price tag.
Every other billing mistake has a recovery path. Wrong code, correct and resubmit. Missing modifier, add it and refile. Authorization not obtained, request retro-auth and appeal. Even post-payment audit findings can be negotiated over time.
Timely filing has no recovery path. Once the deadline passes, the payer's obligation to adjudicate the claim expires. Full stop.
What makes this especially dangerous is that timely filing failures are invisible until they are irreversible. A denied claim shows up immediately and demands attention. A claim approaching its timely filing deadline looks exactly like a normal aging claim, sitting in AR, waiting, not yet demanding anything, right up until the day it becomes uncollectible.
"The most expensive claims in healthcare billing are not the ones that get denied. They are the ones that quietly age past their filing deadline while the billing team is focused on everything else."
The practices losing the most revenue to timely filing are not the ones with careless billing teams. They are the ones without a system that tracks filing deadlines the way it tracks denial deadlines which is most practices.
Filing deadlines are not universal. Every payer operates its own window and the differences are wide enough to create genuine confusion in a practice billing multiple payers simultaneously.
Medicare Part B: 12 months from the date of service. The longest standard window in the market. But that length creates a dangerous complacency, practices assume there is always time, defer follow-up, and discover at month 11 that a cluster of claims never adjudicated properly.
Medicare Advantage Plans: No standard. Each MA plan sets its own timely filing window under its CMS contract. Windows range from 90 days to 12 months depending on the plan. A claim that would be safe under traditional Medicare may already be expired under an MA plan the patient switched to mid-year. Billing teams that assume MA plans follow Medicare timely filing rules are wrong and the revenue loss proves it.
Commercial Payers (BCBS, Aetna, UHC, Cigna): Typically 90 to 180 days from date of service. Some plans allow 12 months. Contracted rates govern, so the window for a specific provider may differ from the payer's default window based on what the provider agreement specifies. If your credentialing team signed a contract 3 years ago and nobody has reviewed the timely filing clause, you may be operating on an assumption that does not match your actual contract.
Texas Medicaid MCOs: The most dangerous category. Most Texas Medicaid MCOs including Molina, Superior HealthPlan, and UnitedHealthcare Community Plan, operate 90-day timely filing windows for original claims. Some allow 90 days from date of service, others 90 days from the date the claim was first rejected or returned. The distinction matters enormously. A claim returned for a missing document on day 45 may have only 45 days remaining, not a full new 90-day window.
Corrected Claims vs. Original Claims: Most payers apply a separate, shorter timely filing window to corrected claims, typically 90 days from the original payment date, not from the date of service. A practice that waits 4 months to correct a billing error may find the corrected claim window has already closed.
The Eligibility Denial That Waited Too Long
The patient is seen. Claim submitted. Payer returns wrong insurance information on file, eligibility verification failed. The denial sits in the queue. The billing team is busy. Two weeks have passed. Then three. The corrected claim finally submits on day 94. The payer's window was 90 days. Denied. Timely filing exceeded.
The eligibility error was fixable in 15 minutes. The timely filing failure was not fixable at all. The delay between identifying the denial and acting on it is what converted a correctable error into a permanent write-off.
The COB Deadline Nobody Tracked
The patient has Medicare primary and a commercial secondary. Medicare adjudicates and sends an EOB at day 30. The secondary claim needs to be submitted within the secondary payer's window, 90 days in many commercial plans, but 90 days from the Medicare EOB date, not from the service date. The EOB sits in the billing team's inbox for 6 weeks before anyone processes the secondary. The secondary claim submits at day 72 from the EOB date technically inside the window. But the secondary payer applies a 60-day window from EOB date in the specific provider agreement signed three years ago. The claim is denied. Timely filing exceeded.
Nobody knew the contract said 60 days. Nobody was tracking the EOB date as a secondary deadline. The money, the patient's coinsurance, often 20 percent of the allowed amount, is gone.
The Credentialing Gap That Expired Claims
A new provider joins the practice. Credentialing is in process. Claims begin submitting under the provider's NPI. The payer returns every claim provider not credentialed. The claims sit in a denied queue while credentialing finalizes. Credentialing completes at day 85. The billing team refiles the claims on day 87. The payer's window was 90 days from the original date of service. For 60 percent of the backlog, the refiling window is still open. For the oldest 40 percent, it is not.
The credentialing delay was manageable. Filing claims before credentialing was complete created the problem. The timely filing failure converted the billing error into a permanent one for the oldest claims in the backlog.
The practices that do not lose revenue to timely filing are not faster at billing. They are smarter about tracking. Here is what that tracking infrastructure looks like in operation:
A payer-specific deadline calendar — not a generic "90-day rule" applied to everything, but a per-payer, per-contract filing window maintained in the billing system. Medicare gets 12 months. Each MA plan gets its actual contracted window. Each commercial payer gets the window from the signed contract, not the industry default. Each Texas Medicaid MCO gets its actual window, including the distinction between original and corrected claim windows. This calendar is not built once and forgotten. It is updated when contracts renew and when payers issue policy changes.
Automated aging alerts tied to filing deadlines — not to 90 days in general, but to the specific deadline for each claim's payer. A claim for a Molina Texas Medicaid patient triggers an alert at day 60, giving the billing team 30 days to resolve it before the window closes. A Medicare claim triggers an alert at day 270, giving 90 days of runway before the 12-month window closes. The alert timing is calibrated to the deadline, not to a generic aging threshold.
Secondary claim EOB tracking — every primary payment generates a secondary claim deadline that is tracked separately from the original service date. The EOB date, the secondary payer's window from that date, and the deadline for secondary submission are all logged and alerted independently of the primary claim's status.
Credentialing-to-billing lockout — no claims submitted for a provider until credentialing is confirmed with each specific payer. If a claim would submit to a payer that has not yet confirmed credentialing, it holds with a notification to the billing team explaining why, and a projected release date based on credentialing timeline. Claims held in this status are tracked against the eventual filing deadline so the release and submission happen before the window closes.
"Timely filing tracking is not a billing team discipline problem. It is a systems problem. No billing team, no matter how experienced, can reliably track per-payer deadlines across hundreds of aging claims in their head. The system has to do it."
For practices reading this with an AR aging report showing claims past 60 days, not everything is lost yet. Here is what is still recoverable and on what timeline:
Denied claims within the appeal window — if a claim was denied within the timely filing window and the appeal deadline has not yet passed, a well-constructed appeal can raise timely filing as a secondary argument alongside the primary denial reason. Some payers will accept proof of timely original submission (clearinghouse confirmation, submission timestamp) to override a timely filing denial if the claim was originally filed on time but returned for another reason.
Claims with documented submission proof — if a claim was submitted on time but the payer claims it was not, the clearinghouse submission report is evidence. Filing deadline disputes can be won when the practice has documented proof of original submission date. This requires the billing system to retain clearinghouse confirmation records — which most systems do, but most billing teams do not know how to retrieve.
Patient billing for non-covered balances — when a claim becomes uncollectible from a payer due to timely filing, the balance may in some cases become a patient responsibility, depending on the provider agreement language and state-specific balance billing rules. This is not universal and requires contract review before pursuing, but it is worth assessing before writing the balance off entirely.
What is not recoverable: any claim where the timely filing window has passed and no exception applies. The write-off is permanent. The only productive response to those claims is a root cause analysis, understanding why the deadline was missed and what system change prevents the same loss in future months.
The $31,000 conversation at the top of this post? Our clients never have it.
Not because their billing teams are more disciplined. Because their system flags claims at day 60 and someone acts before the window closes. Per-payer filing calendars. EOB-triggered secondary deadlines. Credentialing holds that block premature submissions. Alerts timed to give runway, not just notice.
The results our clients see:
Timely filing write-offs under 0.3% of net revenue within 90 days
Secondary claims submitted within 48 hours of primary EOB — every patient, no exceptions
Zero claims filed before credentialing confirmation. Zero.
Timely filing failures are a systems problem. We built the system.
We pull your AR aging, flag every claim near or past a deadline, and show you what is recoverable and what prevention looks like going forward.
