Timely filing limits by payer: what practices need to know in 2026
For Original Medicare, a claim must be filed no later than 12 months, or one calendar year, after the date of service. Every other payer sets its own limit. Commercial plans and Medicare Advantage plans put the deadline in the provider contract or provider manual, Medicaid fee-for-service programs set it by state, and Medicaid managed care plans follow their state contract and their own provider agreements. Because the numbers differ so much, the practical answer is to keep a written list of each payer's filing limit, appeal limit and corrected claim limit, and to submit claims within a few days of the visit so no deadline is ever close.
A claim filed after the deadline is usually denied with CARC 29 (the time limit for filing has expired), and that denial is one of the hardest to overturn. This guide explains how each payer type handles timely filing and how to protect your claims.
Timely filing limits at a glance
| Payer type | Initial claim limit | Usually counted from | Where to confirm |
|---|---|---|---|
| Original Medicare (Part B) | 12 months | Date of service | Your MAC and the Medicare Claims Processing Manual |
| Medicare Advantage | Set by the plan | Date of service, per contract | Your contract and the plan's provider manual |
| Medicaid fee-for-service | Set by each state | Date of service, with state exceptions | Your state Medicaid provider manual |
| Medicaid managed care | Set by the plan within state rules | Date of service, per contract | The plan's provider manual and your contract |
| Commercial plans | Set by contract, often between 90 days and one year | Date of service, per contract | Your participation agreement |
| TRICARE | One year | Date of service | The TRICARE regional contractor |
| Secondary claims | Set by the secondary payer | Often the primary payer's processing date | The secondary payer's coordination of benefits policy |
Treat the table as a starting point. Limits change, and two plans from the same insurance company can have different deadlines depending on the product and your contract.
Medicare
Medicare's rule is set in federal regulation (42 CFR 424.44). Claims must reach the Medicare Administrative Contractor (MAC) within one calendar year of the date of service. A claim received after that is denied and cannot be appealed on the merits.
There are a few narrow exceptions that can extend the deadline, such as an administrative error by Medicare or its contractor, or retroactive Medicare entitlement or disenrollment from a Medicare Advantage plan. These require documentation and a request to the MAC. They do not cover practice-side delays like late charge entry or a lost claim.
Two related Medicare deadlines are worth tracking alongside timely filing:
- Redetermination (first level appeal): 120 days from the date you receive the initial determination
- Reopening for clerical errors: generally within one year of the initial determination, for minor errors that can be corrected without a formal appeal
Medicare Advantage
Medicare Advantage plans are private plans, and their timely filing limits come from your contract with the plan, or from the plan's terms for non-contracted providers. Do not assume the Original Medicare 12-month rule applies. Check the plan's provider manual, and note that some plans use different limits for corrected claims and appeals.
Medicaid
Federal rules give state Medicaid programs an outer limit for most claims, and each state sets its own deadline within those rules. Some states require claims much sooner than 12 months, and each state has its own exceptions for situations like retroactive eligibility or a primary payer that took a long time to process. Medicaid managed care plans can set their own limits within what the state contract allows.
Because these vary so widely, look up the deadline in your state's current Medicaid provider manual and in each managed care plan's manual. You can find state-specific pages on our locations page.
Commercial payers
Commercial timely filing limits are set by your participation agreement and often fall somewhere between 90 days and one year. Out-of-network claims may follow different terms. Some states also regulate filing deadlines for fully insured plans, while self-funded employer plans generally follow federal rules and the plan's own terms. The only reliable source for a given payer is your contract and the payer's current provider manual.
Secondary and corrected claims
Secondary claims are where many practices lose money. The secondary payer has its own filing limit, and many count it from the date the primary payer processed the claim. If the secondary claim is never sent after the primary pays, or is sent with the wrong primary information, the deadline can pass without anyone noticing. Bill secondaries as soon as the primary ERA posts.
Corrected or replacement claims also have limits, and some payers use a shorter window than for the original claim. Check each payer's rule for corrected claims and appeals, not just initial submission.
Other payers with their own rules
Workers' compensation and auto insurance claims follow state law and the carrier's rules, and the deadlines and required forms differ from health insurance. Claims for veterans seen through VA community care programs follow the VA's own filing requirements and the rules of the network administrator. If your practice sees these patients regularly, add each program's limits to the same deadline list you keep for health plans, and confirm them whenever the program announces a change.
How to prove a claim was filed on time
When a payer denies for timely filing and you believe the claim was sent on time, you need proof from outside your own system. Acceptable proof usually includes:
- The clearinghouse acceptance report showing the claim was accepted, with the date
- The payer's acknowledgment report (277CA) showing the payer received it
- An earlier EOB, denial or rejection from the same payer for the same claim
- Records of payer calls with reference numbers
A screenshot from your practice management system showing the claim was "billed" is often not enough, because it shows the claim was created, not that the payer received it. Many payers will not accept a claim the clearinghouse rejected as proof of timely filing, since a rejected claim never entered their system.
Keep this proof organized by payer and date of service. When a timely filing denial arrives months later, the person working it should be able to find the acceptance report in minutes, attach it to the appeal or reconsideration and send it before the appeal window closes too.
Why claims miss the deadline
- Rejections that sit in the clearinghouse queue without being corrected
- Claims sent to the wrong payer, especially after a patient changes plans
- Claims held for a provider whose enrollment was not finished
- Secondary claims that were never sent
- Claims on hold for missing documentation or coding questions
- Denials that were corrected and resubmitted after the payer's corrected claim window
Enrollment delays are a common cause. If a new provider sees patients before their effective date, claims may need to be held, and some payers will not backdate the effective date far enough to cover those visits. Our credentialing services page explains how to plan around that.
How to protect your claims from timely filing denials
- Submit fast. A claim filed within a few days of the visit has plenty of room for correction and resubmission.
- Keep a payer deadline list. Record each payer's initial claim, corrected claim and appeal limits, and review it at least once a year or when contracts renew.
- Work rejections daily. A rejection is the most common way a claim silently runs out of time.
- Add deadline flags to A/R work. Sort aging claims by days remaining before the filing limit, not only by age.
- Save proof of submission. Keep clearinghouse and payer acknowledgment reports where they can be pulled quickly.
- Follow up on held claims. Any claim on hold should have an owner and a release date.
Our denial management work is designed around payer deadlines for this reason, and our guide to reducing accounts receivable covers how to sort A/R by deadline.
How SFA can help
SFA keeps filing and appeal limits in view when working A/R, so claims closest to a deadline get attention first. We have a 24-hour target for submitting clean claims after final review, which leaves room to correct any claim that comes back. A free practice audit is a simple way to check your exposure: we review your billing and walk you through where revenue may be slipping, including claims near their filing limits.
Frequently asked questions
What is the timely filing limit for Medicare?
Original Medicare requires claims to be filed within 12 months, or one calendar year, of the date of service. A few narrow exceptions exist, such as an administrative error by Medicare, and they require documentation.
What is the timely filing limit for Medicaid?
It depends on the state. Each state Medicaid program sets its own deadline and exceptions, and Medicaid managed care plans may set their own limits within state rules. Check your state's current provider manual.
Can a timely filing denial be appealed?
Yes, if you have proof the claim was filed on time, such as a clearinghouse acceptance report or the payer's acknowledgment report. Without that proof, timely filing denials are rarely overturned.
Member of the SFA Solutions revenue cycle team.