Timely filing limits: why a clean claim can still die on the clock.
A perfectly clean, perfectly coded claim is still worthless if it lands after the payer's filing deadline. Timely filing isn't a coding rule or a coverage rule — it's a pure clock, and it's one of the few denial reasons with no clinical argument that can reverse it.
Key takeaways
- Medicare's limit is 12 months from the date of service, applied the same way across every MAC.
- Commercial windows are shorter and payer-specific. There is no single universal commercial number — confirm per payer.
- A rejection doesn't usually reset the clock. The corrected claim still has to land within the original filing window in most cases.
- Timely filing denials are almost never appealable on the merits — the fix is tracking, not disputing.
Medicare's 12-month rule, as the anchor example
Medicare claims have to be received by the appropriate Medicare Administrative Contractor no later than 12 months, or one calendar year, from the date the service was furnished. This applies consistently whether the MAC is Novitas, Palmetto GBA, or any other jurisdiction — the rule itself doesn't vary by contractor, even though the portal and correspondence you'd use to check status does. A claim with a date of service of March 31 of one year has to be received on or before March 31 of the following year; timeliness is judged by the date Medicare actually receives a processable claim, not the date you submitted it from your own system.
Rejected claims that need to be corrected and resubmitted still fall under this same 12-month window measured from the original date of service in the general case — the rejection itself doesn't restart the clock. That makes Medicare's rule simple to state but unforgiving in practice: a claim that sits in a rejected-but-unworked queue for eleven months has almost no runway left to be fixed and resubmitted.
Why commercial timely filing runs shorter
Commercial payers set their own timely filing windows by plan and contract, and they are typically shorter than Medicare's 12 months — often somewhere in a 90-to-180-day range, though the exact number varies enough by payer that stating one universal figure would be misleading. This is precisely the kind of detail that has to live in your own payer-mix reference sheet, not in institutional memory, because a biller who's used to Medicare's generous year-long window can lose real revenue applying that same mental model to a commercial payer with a 90-day limit.
| Payer type | Typical filing window | What resets it |
|---|---|---|
| Medicare | 12 months from date of service | Generally nothing — a corrected claim still has to land inside the original window |
| Medicaid (state-administered) | Varies by state, often shorter than Medicare | Confirm per state; do not assume Medicare's rule applies |
| Commercial (typical range) | Often 90–180 days, payer- and plan-specific | Confirm per payer contract; do not assume a uniform number across your payer mix |
What actually resets the clock, and what doesn't
The most expensive misunderstanding on this topic is assuming that fixing and resubmitting a claim starts a fresh countdown. In the general case it doesn't: the timely filing window is measured from the original date of service, and a correction is exactly that — a correction to the same claim, not a new one with its own new deadline. This is precisely why letting a rejected claim sit unworked is so costly: every day it sits is a day gone from the original window, not a day added back once someone finally looks at it.
Where a genuine exception can apply, it's typically tied to specific, documentable circumstances the payer defines (a documented eligibility delay outside the practice's control, for example) rather than a general grace period for being busy. Practices that build a filing-deadline extension into their workflow as the default plan, rather than the narrow exception it actually is, are the ones who lose the claim entirely when that assumption turns out to be wrong.
Tracking deadlines centrally instead of payer by payer
The operational fix for timely filing risk isn't cleverness at the individual claim level — it's a tracking system that flags a claim's specific deadline the moment it's created, independent of which payer it's headed to. A practice billing a mixed payer panel needs the filing deadline calculated per claim, not assumed from whichever payer the biller worked most recently, and a claim sitting unresolved needs to surface on a report well before its deadline, not the week it expires.
This is exactly the discipline our A/R aging workflow is built around: a claim that's aging isn't just a collections problem, it's a countdown, and the two views need to be the same report, not two separate ones a biller has to reconcile by hand.
Build your rejection-working queue around age since date of service, not age since the rejection was received. A rejection that's ten days old but attached to a claim with a date of service four months back has far less runway than the raw "days since rejected" number suggests.
Worried claims are quietly aging past their filing deadline?
We track filing deadlines centrally, per claim, per payer, so nothing expires because nobody was watching the clock.
Frequently asked questions
What is Medicare's timely filing limit?
12 months, or one calendar year, from the date of service, applied consistently across Medicare Administrative Contractors. A claim with a date of service of March 31 has to be received by the MAC on or before March 31 of the following year. This is determined by the date the claim is received, not the date it was mailed or submitted from your system.
Is the commercial timely filing limit the same as Medicare's?
No, and it's usually shorter. Commercial payer timely filing windows are set by the individual payer and plan, commonly landing somewhere in a 90-to-180-day range, but this varies enough that you need to confirm it per payer rather than assume a single number applies across your whole payer mix.
If a claim rejects and I fix it, does the clock reset?
Generally no. A rejected claim usually still has to land within the original timely filing window measured from the date of service, not from the date of the rejection or the resubmission. A rejection that sits unworked for weeks can quietly consume a meaningful share of a short commercial filing window before anyone notices.
Confirm before you rely on this. Payer edit rules, clearinghouse requirements and timely filing limits change and vary by payer. The process information on this page reflects standard industry practice as of August 2026 and is provided for general education — verify current requirements directly with your clearinghouse and payer mix before relying on it.