Timely Filing Limits: Payer Deadlines and How to Track Them

Every medical claim has an expiration date. Not the date printed on the superbill or the date it appears in your practice management system - but a hard, non-negotiable deadline set by the payer that determines whether your claim will even be considered for payment. Miss that deadline and there is no appeal, no exception, and no recourse. The money is gone.

This is the reality of timely filing limits in medical billing: each payer sets its own deadline, each deadline is different, and most practices don't have a systematic way to track which claims are approaching which payer's cutoff. The result is predictable. Revenue walks out the door not because the claim was wrong, but because it was late.

This guide covers the deadlines that matter most, when each clock starts, and a simple way to track them.

What Timely Filing Actually Means

A timely filing limit is the maximum number of days a payer allows between the date of service (or another triggering event) and the date the claim is received by the payer. If the claim arrives after that window closes, the payer will deny it with a timely filing denial - the standard reason code meaning "the time limit for filing has expired." This denial is final. It cannot be billed to the patient. It is a pure write-off.

What makes timely filing especially dangerous is that the deadlines vary dramatically by payer. Medicare gives you 12 months. Medicaid deadlines vary by state - some give you 12 months, others give you 90 days. UnitedHealthcare gives in-network providers 90 days for commercial claims. If your billing team tracks deadlines based on a single rule of thumb like "submit everything within 30 days," they may be hitting Medicare's deadline comfortably while silently losing claims to payers with tighter windows.

Timely Filing Limit

The maximum number of days a payer allows for initial claim submission, measured from the date of service (or another triggering event such as date of eligibility determination). Claims submitted after this deadline are denied, and the practice usually cannot bill the patient for them. Each payer sets its own timely filing limit, and the deadline applies to the date the payer receives the claim - not the date it was sent.

Clean Claim

A claim that contains all required data elements, is submitted in the correct format, and has no deficiencies that would cause it to be rejected or returned. Timely filing deadlines apply to when the payer receives a clean claim - a rejected claim that is corrected and resubmitted must still meet the original filing deadline.

Why Claims Expire and What It Costs You

Timely filing write-offs are one of the most expensive problems in medical billing precisely because they are invisible. A denied claim shows up in your denial report. A claim that was never submitted - or was submitted to the wrong payer and never corrected - doesn't show up anywhere. It exists only as a gap between services rendered and claims filed, and most practice management systems don't flag that gap automatically.

Late claims usually come from the same few places: claims held pending authorization verification that never got submitted, claims denied for eligibility that were never resubmitted after correcting the payer information, secondary claims that were never filed because the primary EOB wasn't posted promptly, and claims that were rejected (not denied) for formatting issues and never resubmitted.

Each of these scenarios has a common thread: the initial claim action happened, but the follow-up action didn't. The filing window quietly closed while the claim sat in a queue, and by the time someone noticed, the deadline had passed. This is why accounts receivable management and timely filing are inseparable - a claim you're not actively tracking is a claim that's silently expiring.

• -Claims submitted to the wrong payer - If a patient's coverage changed and the claim went to the old insurer, the denial comes back weeks later. By the time the claim is corrected and sent to the right payer, the filing window may already be closed.
• -Secondary claims never filed - When a primary payer adjudicates a claim, the secondary payer's timely filing clock may have been running since the date of service, not the date of primary payment. Delayed EOB posting means delayed secondary submission.
• -Rejected claims confused with denied claims - A rejected claim was never processed - it bounced back due to a formatting or data error. Rejections don't stop the timely filing clock. The original deadline still applies.
• -Authorization delays - Claims held because prior authorization wasn't obtained or confirmed. The filing deadline doesn't pause while your team resolves the auth issue.
• -Staffing gaps and backlogs - Billing staff turnover or vacation creates a backlog. Claims that would normally be filed within a week sit for weeks, eating into the filing window before anyone catches up.

Timely Filing Limits by Payer

The table lists only limits we could check against the rule or the payer's own current guide. For every other payer, the limit is in your contract or the plan's provider manual. Out-of-network limits and state law can change the number.

Date of Service vs. Date of Denial: When the Clock Starts

One of the most common sources of confusion in timely filing is understanding when the clock starts. For initial claims, the answer is usually straightforward: the timely filing clock begins on the date of service (DOS). But for corrected claims, appeals, and secondary submissions, the triggering event can be different - and getting it wrong can cost you the claim.

The critical trap here is with secondary payers. Some secondary payers start the timely filing clock from the date of service, not from the date the primary payer adjudicated the claim. If Medicare is primary and takes 30 days to pay, and the secondary payer has a 90-day timely filing limit from the DOS, you only have 60 days from receiving the Medicare EOB to submit the secondary claim. If posting the primary payment takes another 2-3 weeks internally, your effective window for secondary submission is less than 40 days.

Other secondary payers - and this is where it gets important - start the clock from the date of the primary payer's remittance advice. This gives you a fresh window. But you won't know which rule applies unless you check the specific payer's provider manual or contract. Making assumptions here is the fastest way to lose secondary claims to timely filing.

Corrected Claim

A claim resubmitted to a payer with corrections after the original claim was denied or paid incorrectly. Corrected claims are flagged as a replacement of (or a void of) the original claim so the payer does not treat them as duplicates. The timely filing deadline for a corrected claim is typically measured from the date of the original remittance advice - not from the original date of service. However, the original claim must have been filed within the initial timely filing deadline for the corrected claim to be accepted.

Corrected Claims and Appeal Deadlines

Understanding the distinction between initial filing, corrected claim submission, and formal appeals is critical because each has its own deadline and each follows different rules. Filing a corrected claim when you should have filed an appeal - or vice versa - can waste the window you needed.

1. 01Initial filing deadline. This is the window for submitting the original claim. It's measured from the date of service and is the deadline most people think of when they hear "timely filing." If you miss this, the claim is dead - no corrected claim or appeal will save it.
2. 02Corrected claim deadline. After a claim is denied or paid incorrectly, you can resubmit a corrected version flagged as a replacement of the original. This deadline is typically measured from the date of the remittance advice. The window varies by payer. The corrected claim must reference the original claim number.
3. 03Appeal deadline. If a claim is denied and you believe the denial is incorrect, you file a formal appeal. Appeal deadlines are measured from the denial notice and vary by payer. Medicare allows 120 days from when you receive the notice, and Aetna's provider dispute standard is 180 days. Appeals require supporting documentation - clinical notes, authorization records, or coding rationale.
4. 04Reconsideration deadline. Some payers offer a reconsideration process that's faster and less formal than a full appeal. Medicare's redetermination (first-level appeal) must be filed within 120 days of receiving the remittance notice. Commercial reconsideration windows vary by payer.

The relationship between these deadlines matters. A corrected claim is not an appeal - it's a new claim submission with corrected data. An appeal is a formal dispute of the payer's adjudication decision. Some billing teams submit corrected claims when they should be filing appeals, which means the denial reason isn't addressed and the claim gets denied again - this time potentially past the appeal window. Sort each denial by the right fix before acting on it; our denial management page explains how.

State-Specific Timely Filing Rules

Federal payers like Medicare and Tricare have uniform national timely filing rules, but state-regulated programs - Medicaid, workers' compensation, and state-mandated commercial insurance rules - vary significantly by state. Some states impose prompt-payment laws that require insurers to pay clean claims within a set number of days, and these laws can indirectly affect timely filing by setting standards for what constitutes a "received" claim.

Medicaid timely filing limits are the most variable. Medi-Cal in California allows six months from the end of the month of service, with reduced payment for later claims. New York Medicaid allows 90 days, and Texas Medicaid allows 95 days from the date of service. Florida Medicaid allows 12 months for fee-for-service, but most Florida Medicaid claims go to managed care plans with their own limits. These differences mean a practice operating in multiple states - or seeing patients with out-of-state Medicaid coverage - must track state-specific Medicaid deadlines independently.

Our state billing laws reference collects Medicaid filing rules and prompt-pay laws by state, each with its source. Check it, and the state agency's own manual, before you rely on a number.

Payer-Specific Traps That Cause Write-Offs

Beyond the published deadlines, each payer has operational quirks that can catch billing teams off guard. These aren't policy violations by the payer - they're features of how each payer processes claims that create timely filing risk if you don't know about them.

1. 01UnitedHealthcare's 90 days. UHC gives participating providers 90 days from the date of service for commercial claims, unless the contract or state law says otherwise. Submit electronically and keep the acceptance report as proof of when the claim was received. A claim mailed near the deadline can arrive too late.
2. 02BCBS plan variation. Blue Cross Blue Shield is a federation of separate companies, so deadlines vary by state plan. Your team must look up the specific BCBS plan, not assume a single BCBS deadline applies across all patients.
3. 03Medicaid retro-eligibility. When a Medicaid patient's eligibility is determined retroactively, the timely filing clock may start from the date of eligibility determination rather than the date of service. This can create a situation where the original claim was filed to the wrong payer, the eligibility determination comes back months later, and the practice now has a compressed window to file the Medicaid claim.
4. 04Medicare Advantage mismatch. Medicare Advantage plans are run by private insurers. Their filing limits depend on your contract with the plan, not on traditional Medicare's 12-month window. Check the contract; do not assume a Medicare Advantage patient gets Medicare's 12 months.
5. 05Workers' compensation state variation. Workers' comp filing rules are set by state law, often with separate deadlines for the injury report and the bill. Check the state rule before you file.

What Happens When You Miss a Deadline

Understanding the consequences of a missed timely filing deadline is important because the impact is final and the options are extremely limited. Unlike a coding denial or an authorization denial, a timely filing denial has almost no recovery path.

1. 01The claim is denied for timely filing. The payer issues a denial with the standard reason meaning "the time limit for filing has expired," or a similar proprietary reason code. The denial notice will show the allowed amount as $0.
2. 02The balance cannot be billed to the patient. Per your provider agreement with the payer, timely filing failures are the provider's responsibility. You cannot send the patient a bill for the denied amount. Doing so violates your contract and may violate state balance-billing laws.
3. 03The claim becomes a write-off. The charge is written off as a contractual adjustment. It appears in your financial reports as lost revenue - not as a denial to be worked, but as money that will never be collected.
4. 04Appeal options are nearly nonexistent. Most payers will not overturn a timely filing denial unless you can prove the claim was submitted on time (with electronic confirmation or certified mail receipt) or that the delay was caused by the payer's own system error. "We didn't know the deadline" or "our staff was short-handed" are not valid appeal arguments.
5. 05The only exception: proof of timely submission. If you have documentation proving the claim was received by the payer within the filing window - such as an electronic submission confirmation, a clearinghouse receipt with timestamp, or a certified mail return receipt - you may be able to overturn the denial. This is why electronic submission with confirmation tracking is non-negotiable for every claim.

A Practical Filing Deadline Tracking Workflow

Preventing timely filing losses requires a systematic approach. Individual vigilance is not enough - when a billing team manages hundreds or thousands of claims across dozens of payers, deadlines will be missed unless there's a process that makes them visible before they expire. Here is a workflow an in-house billing team can run.

1. 01Submit every claim within 3-5 business days of the date of service. This is the single most important step. Regardless of which payer the claim goes to, submitting within the first week gives you the maximum runway against every deadline. Build this into your daily billing workflow - charges entered today should be scrubbed and submitted today or the next business day.
2. 02Use electronic submission with confirmation tracking for every claim. Never mail a claim without also submitting electronically. Your clearinghouse should provide a submission confirmation with a timestamp for every claim. Save these confirmations - they are your proof of timely filing if a payer issues a timely filing denial.
3. 03Build a payer-specific deadline matrix. Create a reference document listing every payer in your mix with their initial filing deadline, corrected claim deadline, appeal deadline, and any notes about plan-specific variations. Update it annually or whenever you receive notice of a deadline change.
4. 04Run a weekly "approaching deadline" report. Pull a report every Monday of all unpaid claims aged 60+ days and segment them by payer. For payers with 90-day deadlines, any claim at 60 days is 30 days from permanent write-off. Escalate these claims immediately - call the payer, verify claim receipt, and document the status.
5. 05Track rejected claims separately from denied claims. A rejected claim was never processed. The timely filing clock is still running. Build a daily workflow for reviewing rejections, correcting the data error, and resubmitting on the same day. No rejection should sit unresolved for more than 48 hours.
6. 06Automate secondary claim submission. Configure your practice management system to automatically generate secondary claims when primary EOBs are posted. If secondary submission depends on manual action, delays are inevitable. For practices using AR management workflows, this automation is critical.
7. 07Conduct monthly timely filing audits. At the end of each month, review all claims denied for timely filing. Calculate the total dollar amount written off. Track the trend over time. Identify which payers and which internal workflow gaps generated the losses. This audit turns timely filing from an invisible problem into a visible, measurable metric.

How Medtransic Can Help

Medtransic handles billing for therapy and behavioral health practices, including claim submission, follow-up and denials. We charge 4-8% of collections, and every client has a dedicated account manager.

• -Claims are filed and followed up against each payer's own deadline.
• -Denials are sorted by the right fix: corrected claim or appeal.
• -If you are not sure whether claims are expiring in your accounts receivable, request a free billing review.

Sources & References

• -42 CFR 424.44 - Medicare's 12-month filing limit from the date of service
• -CGS Medicare, Timely Filing - how the 12-month limit is measured
• -42 CFR 405.942 - Medicare redetermination, 120 days from receipt of the initial determination
• -UnitedHealthcare 2026 Administrative Guide - filing limits for participating, non-participating and Medicare Advantage claims
• -Aetna, Provider Disputes and Appeals - the 180-day provider dispute standard
• -Blue Cross Blue Shield Association, The BCBS System - the separate companies behind BCBS plans
• -State Medicaid rules: California Welfare and Institutions Code 14115; New York 18 NYCRR 540.6(a)(1); Texas Medicaid Provider Procedures Manual, Section 6; Florida AHCA Provider Reimbursement Handbook
• -X12, Claim Adjustment Reason Codes - the official denial-reason list, including the code for expired timely filing
• -Sources checked October 2026.