Yes, there is a time limit on billing for medical services. Every payer sets a timely filing deadline — the last date a clean claim can be submitted for a date of service. Miss it, and the claim is denied with almost no chance of recovery.
Timely filing is the one denial category where prevention is the entire strategy. A coding error can be corrected and resubmitted; a missed filing deadline usually cannot. This page covers the deadlines by payer type, what happens when they pass, and how to track them.
Medicare: 12 months from the date of service
Under federal regulation 42 CFR 424.44 and the Medicare Claims Processing Manual, Chapter 1, Section 70, Medicare fee-for-service claims must generally be filed with the appropriate Medicare contractor no later than 12 months (one calendar year) after the date the services were furnished. Last reviewed 2026-10-08.
The details that matter:
- The clock starts on the date of service. For professional claims, Medicare uses the line-item “from” date; for institutional claims, the “through” date on the claim.
- If a claim spans multiple line items, contractors can split lines: services on timely lines may be paid while untimely lines are denied.
- Narrow exceptions exist (for example, certain administrative errors or retroactive entitlement), but they are limited and specifically defined. Do not plan around exceptions.
- Medicare Advantage plans generally follow the same framework, with their own published rules for clean claims — check each plan’s provider manual.
One Medicare-specific warning: claims denied as untimely have very limited appeal options. A late-filed claim generally cannot be rescued through the standard appeals process. For participating providers, the loss also generally cannot be billed to the patient — the practice absorbs it.
Medicaid: varies by state
There is no single Medicaid timely filing deadline. Each state sets its own, and they range from about 90 days to 12 months from the date of service. Some states allow corrected claims or resubmissions within the original window; others apply separate, shorter windows for crossover claims (where Medicare paid first).
Because Medicaid deadlines are state-specific and change by policy update, always verify the current rule in your state’s provider manual — never assume a neighboring state’s deadline applies to you.
Commercial payers: whatever the contract says
Commercial filing deadlines are defined by the payer contract and vary widely. Typical windows run 90 to 180 days from the date of service, with some plans allowing up to a year. In-network providers are bound by the contracted deadline; out-of-network claims may face different terms but are not exempt from filing limits.
Two things to watch with commercial plans:
- Secondary claims have their own clocks. After the primary payer pays or denies, many plans start a fresh filing window (often 90 days from the primary payer’s determination). The secondary deadline can be missed even when the primary claim was timely.
- “Received by” vs. “submitted by.” Most payers measure from the date they receive the claim, not the date you sent it. A claim held in your scrubber for two weeks loses two weeks of its window.
What happens when the deadline passes
A missed timely filing deadline produces one of the least forgiving denials in billing:
- The claim is denied as untimely, and the contractual adjustment usually leaves no patient balance to pursue — for Medicare and most contracted commercial plans, the provider cannot shift the loss to the patient.
- Recovery rates for timely filing denials are among the lowest of any denial category. The appeal path is narrow or nonexistent, especially under Medicare.
- A pattern of timely filing denials usually points to an upstream workflow problem: slow charge entry, scrubber holds that nobody clears, clearinghouse rejections that sit in a queue, or credentialing gaps that keep claims from going out.
This is why timely filing shows up in denial management reviews as a leading indicator of process health. If your untimely denials are rising, the fix is in the workflow, not at the payer.
How to track filing deadlines
Build deadline tracking into the revenue cycle rather than treating it as a year-end cleanup:
- Submit claims daily. Charge entry and claim submission should happen within days of the encounter, not weeks. Every day of delay is a day off every filing clock.
- Monitor the clearinghouse queue daily. Rejected claims are not “submitted.” A rejection that sits uncorrected for a month can quietly push a claim past a 90-day commercial deadline.
- Run an aging report by payer deadline, not just by age. A 100-day-old claim is urgent under a 90-day plan and routine under Medicare. Sort worklists by days remaining, not just days outstanding.
- Calendar the secondary-payer clock. When the primary remittance arrives, start the secondary filing countdown immediately — do not wait for a batch cycle.
- Watch the “from” date on multi-date claims. Split long date spans so timely services are not dragged down by untimely lines.
- Set alerts at 60 and 90 days. Automated aging alerts at fixed thresholds catch stalled claims before any deadline is in danger.
If your team is already stretched thin, this is exactly the kind of routine monitoring that medical billing collections support and outsourced billing workflows handle systematically.
Frequently asked questions
Is there a time limit on billing for medical services?
Yes. Every payer sets a timely filing deadline. Medicare generally requires filing within 12 months of the date of service; Medicaid deadlines vary by state; commercial plans set their own by contract, often 90 to 180 days.
What happens if a claim misses the timely filing deadline?
It is denied as untimely, and the denial is usually final. Recovery options are very limited, and for Medicare participating providers the loss generally cannot be billed to the patient.
Can a timely filing denial be appealed?
Rarely with success. Medicare untimely filing denials have very limited appeal options. Commercial appeal rights depend on the contract, but most plans treat their filing deadline as firm. Prevention is the only reliable strategy.
Does the deadline start on the date of service or the date I submit?
The clock starts on the date of service (or the through date for institutional claims). Most payers then measure to the date they receive the claim — so internal delays count against you.
What about claims where the patient had retroactive coverage?
Some payers and state Medicaid programs provide exceptions when coverage is granted retroactively. These are narrow, payer-specific provisions — verify the rule in the payer’s manual rather than assuming it applies.
How far back can a patient be billed?
That depends on state law, the payer contract, and whether the claim was ever filed. Timely filing rules govern payer submission, not patient billing, but a claim denied as untimely generally cannot be converted into a patient bill for participating and in-network providers.
Timely filing is a discipline, not a negotiation. If your practice is losing claims to missed deadlines, Get a Free Billing Audit.
Medical Billing & Revenue Cycle Management is a remote company serving practices in all 50 states: +1 (307) 396-4107 or contact@medicalbillingservicesgroup.com.
General educational information, not legal advice or a guarantee of reimbursement. Requirements vary by payer, plan, setting and date of service.