Timely Filing Limits by Payer: How to Find Yours Before It Expires

What a timely filing limit is, and why the number changes by payer

A timely filing limit is the deadline a payer sets for a claim to reach it. The clock usually starts on the date of service. Miss the window and the payer denies the claim for late filing, and because a late claim is not a coverage dispute, there is usually no appeal and no option to bill the patient for the balance. Timely filing limits are an operations control, not a coding one.

There is no single national number. Original Medicare runs on a federal rule at 42 CFR 424.44. Medicaid runs on a federal ceiling with a shorter state deadline inside it. Commercial payers set their own windows, and the plan you signed with can differ from the number a colleague quotes. Every figure below is traced to the regulation, payer document or state manual it comes from.

Medicare fee-for-service: one calendar year, counted to receipt

Original Medicare gives a provider one calendar year, or 12 months, from the date of service to file a claim. The rule is written into 42 CFR 424.44, and it took effect for services furnished on or after January 1, 2010, under section 6404 of the Affordable Care Act. Before that law, the window ran as long as 27 months, depending on the date of service.

The date that counts is the day the Medicare Administrative Contractor receives the claim. It is not the day you submitted it, not the date the claim was created in the billing system and not the postmark. Noridian, one of the MACs, states it plainly: to be timely, a claim has to make it to the payment floor.

If the last day of the window lands on a Saturday, Sunday, federal holiday or other federal nonworkday, the deadline moves to the next workday under 42 CFR 424.44(c). Paper filings create the most risk, because a claim mailed on the final day can arrive a day late and be denied.

Medicare Secondary Payer claims carry the same 12-month limit. The clock starts on the date of service and keeps running while the primary payer processes its claim, so waiting on a primary payment can burn the secondary window before the first claim is even filed.

Timely filing limits by payer: the working table

The table gives the published window for the largest programs and a sample of commercial plans. Read the last column before you use any number, because that column is where the number comes from. Where a payer publishes no single figure, the table says so instead of guessing at one.

Two patterns are worth naming. The Blue Cross Blue Shield system is a federation of independent companies, so a deadline that holds at one affiliate does not hold at the next. And a commercial window is a contract term. Cigna publishes 90 days for participating providers and 180 for out-of-network providers, and both give way to a longer period when a law or your agreement requires it.

Aetna publishes a 180-day dispute filing standard and then lists state exceptions, such as 120 days to submit a claim in New York. UnitedHealthcare does not print a number at all. Its administrative guide tells providers to refer to their participation agreement, which is the honest answer for most commercial work.

Medicaid: one federal ceiling, fifty different deadlines

Federal rules set the outer edge for state Medicaid programs. Under 42 CFR 447.45, a state agency must require providers to submit all claims no later than 12 months from the date of service. A state can set a shorter limit, and many do.

The table shows how wide that range runs. New York allows 90 days, Texas 95 and Washington a full year. Every figure comes from that state’s own billing manual or provider guide, because Medicaid deadlines change whenever the manual is revised.

Managed care adds a second layer. Most Medicaid members are enrolled in a managed care organization, and the plan contract can set a shorter deadline than the state fee-for-service rule. When a member is in an MCO, the plan manual controls, not the state table.

The four Medicare exceptions, and what they do not cover

Medicare allows four exceptions to the 12-month rule, all listed in 42 CFR 424.44(b). Each has to be documented, and each is submitted as a reopening request rather than a standard appeal. There is no fifth exception for a busy month, a staffing gap or a delayed vendor.

An approved exception extends the window to the last day of the sixth calendar month after the month that triggered it. No exception can push a valid filing past December 31 of the third calendar year after the year of service, except that a service furnished in October through December can extend to the end of the fourth year.

Reading a timely filing denial on the remittance

When a claim misses the window, the payer explains it on the 835 remittance with a claim adjustment reason code. The live wording comes from the X12 code list, not from a payer crosswalk or a vendor blog, because both go stale and neither shows deactivations.

The same caution applies to remark codes. Some sources label N390 as a late filing remark. On the current X12 list, N390 reads as a service that cannot be billed separately, which is a different problem with a different fix. Check the code against the live list before you build a workflow on it.

A corrected or adjusted claim follows separate rules from an original. Under Medicare, an adjustment to a claim that was filed on time can still be processed after the 12-month window, because the original claim already met the limit. Late filing is the failure to file at all, not the later effort to fix a filed claim.

How to find your own timely filing limit before it expires

The limit that applies to a claim is not a number you memorize. It is a number you look up per payer and per contract, then track against a calendar. The routine below is what keeps a filing deadline from arriving unnoticed in the middle of a busy week.

1. 01

   Start with the contract, not a table

   For any payer that is not Original Medicare, open the participation agreement and the current provider manual. The published window and your contracted window are often different numbers.

2. 02

   Set an internal deadline well inside the legal one

   Work to a cutoff that leaves room to fix a rejection and refile, because the clock keeps running through every rejection and every returned claim.

3. 03

   Track receipt, not submission

   A clearinghouse transmission is not a filed claim. Confirm the payer accepted it and store the acknowledgment as your proof of timely filing.

4. 04

   Log the anchor date by claim type

   Use the date of service for professional claims and the through or discharge date for span institutional claims, and record it where the aging report can see it.

5. 05

   Check exceptions the week the denial posts

   When a claim does miss, review the four Medicare exceptions or the payer’s own exception rule at once, while the supporting documentation is still easy to gather.

• Keep the participation agreement and current provider manual on file for every payer you bill
• Set a written internal filing cutoff per payer, not one number for the whole practice
• Save every payer acceptance acknowledgment as proof of timely filing
• Review aged, unbilled and rejected claims on a fixed weekly schedule
• Recheck state and commercial deadlines when a provider manual is revised

Operationally, late filing sits inside denial management and the wider AR management calendar. The clean-claim work that prevents most late filings belongs to medical billing and medical coding.

What to ask a billing partner about filing deadlines

A partner that loses claims to filing deadlines will often report a denial rate that looks fine, because a late claim is written off rather than appealed. Four questions separate a team that tracks deadlines from one that discovers them after they have passed.

• Ask how filing deadlines are tracked per payer and per contract. A team that owns the calendar can show you the calendar.
• Ask for the internal cutoff on each payer, and how far it sits inside the legal deadline.
• Ask what share of claims carry a stored acceptance acknowledgment, because that is the proof of timely filing when a payer disputes receipt.
• Ask what changed in the front end after the last late-filing denial, since a deadline missed twice is a process problem rather than bad luck.

We run this work across full-cycle medical billing, denial management and prior authorization. If late filings are eating into collections, a revenue cycle health check or a closer read of your days in A/R will show where the time is going. The claim denial codes reference covers the remittance side in more depth.

Questions practices ask us about this