A timely filing limit is a clock, not a coverage rule. It doesn’t ask whether a service was medically necessary or eligible for benefits — it asks whether the claim showed up in time. A plan sets the window in its plan document or provider contract specifically so it isn’t adjudicating claims for services rendered years ago, with no reasonable ability to verify eligibility, pricing, or coordination of benefits as they stood at the time.
How the window is set
There’s no single standard window — it’s a plan-document and contract term that varies by plan, by network, and sometimes by claim type within the same plan. Ninety days, 180 days, and 365 days from the date of service are all common, and the clock can start at a different point for a secondary claim: many plans measure timely filing for a coordination-of-benefits claim from the date of the primary payer’s EOB, not the original date of service, since the provider couldn’t have billed the secondary plan before knowing what the primary plan decided.
| Claim type | Common filing window | Clock starts |
|---|---|---|
| In-network, primary claim | 90–180 days | Date of service |
| Out-of-network, primary claim | 180–365 days | Date of service |
| Secondary claim (COB) | 90 days | Date of primary EOB |
Actual windows are set by the specific plan document and provider contract governing a given claim — this table shows common ranges, not a rule that applies uniformly across every plan.
How it’s enforced at adjudication
At adjudication, the system compares the claim’s received date against the applicable filing window measured from the correct starting point for that claim type. A claim that clears the window prices normally. A claim that arrives past it gets flagged with a timely-filing denial reason rather than being priced and paid — the denial happens before pricing runs, not after, since there’s no benefit question left to resolve once the window has closed.
A worked example
A provider bills $18,400 for a surgical procedure. The plan’s allowed amount for the procedure is $12,900. The network contract sets a 180-day timely filing limit from the date of service. The claim arrives 210 days after service — 30 days past the deadline.
Had it arrived on time, the plan’s 80/20 coinsurance split would have paid the provider $10,320 (80% of $12,900) and left the member owing $2,580 (20%). Instead, the claim denies for exceeding timely filing, and the full $12,900 allowed amount goes unpaid. Because the provider is contracted and timely filing is the provider’s own obligation under that network contract, the provider generally can’t shift that loss onto the member by balance billing them for it — the $12,900 is the provider’s cost for filing late, not the member’s.
Appeals and exceptions
A late-filed claim isn’t automatically the end of the matter. Plans commonly allow an appeal when a provider can show the delay wasn’t really theirs — a claim originally filed on time to the wrong payer, a retroactive eligibility change that delayed the correct filing address, or documentation of an earlier timely submission that the plan has no record of receiving. Whether a given circumstance actually qualifies as an exception, and what has to be proven to establish it, depends on the specific plan document’s appeal language and applicable state prompt-pay rules — this isn’t a categorical right to reinstate a late claim, and treating it as one would be inaccurate.
Why this matters operationally
A pended claim and a timely-filing denial both stop a claim short of payment, but they resolve differently: a pend needs an adjudicator’s judgment call, while a timely-filing denial is a date comparison a rules engine should catch consistently, every time, without a person re-checking the calendar by hand. A claims adjudication engine that applies the correct window per claim type — and starts the clock from the right date for COB claims instead of defaulting to date of service — is what keeps filing-limit denials defensible instead of arbitrary. For a TPA administering multiple client plans, each with its own contracted filing windows, that per-client configuration is the difference between an enforceable deadline and a support call nobody can explain.