Aetna’s timely filing limit for in-network commercial claims is generally 90 days from the date of service, while out-of-network and non-participating claims get 12 months. But that’s a starting point, not a universal rule — the actual deadline on any given claim depends on the specific plan, the provider’s contract, and, in some cases, state law that overrides the standard window.
What Is a Timely Filing Limit?
A timely filing limit is the maximum number of days a provider has to submit a claim to a payer after the date of service. Miss it, and the payer denies the claim as untimely — a denial that is almost never reversible on appeal unless the practice can document a valid exception, like a payer system error or a documented delay caused by coordination of benefits with a primary payer.
Timely filing denials are purely administrative. They don’t turn on medical necessity or coding accuracy — they turn on the calendar, which makes them one of the most preventable categories of lost revenue in a billing operation, and one of the most frustrating to lose given there’s no clinical argument to make afterward.
Aetna’s Timely Filing Windows by Claim Type
- In-network commercial claims: generally 90 days from the date of service, though some Aetna product lines, including certain student health plans, use a 120-day window instead
- Out-of-network / non-participating claims: generally 12 months from the date of service
- Medicare Advantage: commonly cited around 120 days, but Medicare Advantage plans set their own contracted terms rather than following Original Medicare’s federal 12-month rule, so the actual deadline comes from the specific plan agreement
- Medicaid managed care plans administered by Aetna: often extend to 180 days, though this varies by state Medicaid program
- Corrected claims and resubmissions: typically 180 days from the date of the original denial, separate from the initial filing deadline
- Appeals: generally 60 days from the date of the denial or adjudication decision being appealed
The deadline is based on the date Aetna receives the claim — through its EDI gateway or mailroom — not the date the practice submitted it. A claim that leaves the clearinghouse on day 89 but doesn’t reach Aetna’s system until day 91 misses the window.
Why the Contract Matters More Than the General Rule
Every source citing an Aetna timely filing number is describing a general standard, not a guaranteed figure for every practice. The specific number that applies to a given practice’s claims comes from that practice’s own provider agreement with Aetna, which can set a different window than the general commercial standard. Before treating any published number as gospel, a billing team should confirm the actual language in the practice’s contract and the current claims submission manual for the specific product the patient is enrolled in.
How to Avoid Timely Filing Denials
- Submit claims within days of the encounter, not weeks — the earlier a claim leaves the building, the more buffer exists if it bounces back for a correction and needs resubmission.
- Track claims by submission date, not just by payer, so a claim sitting unresolved for 60+ days triggers a follow-up before it’s too late to fix and resubmit.
- Document COB delays in writing. If a claim is late because the practice was waiting on a primary payer’s EOB before billing Aetna as secondary, that delay is a recognized exception — but only if it’s documented.
- Audit clearinghouse rejection reports daily. A claim rejected at the clearinghouse level never reached Aetna, and the timely filing clock keeps running while it sits unaddressed in a rejection queue.
Frequently Asked Questions About Aetna Timely Filing
What is Aetna’s timely filing limit for in-network claims?
Generally 90 days from the date of service for participating commercial providers, though the specific number depends on the plan and the provider’s contract, so it should be confirmed against the current provider manual.
What happens if a claim misses Aetna’s timely filing deadline?
The claim is denied, typically with a CO-29 denial code, and that denial is generally not reversible on appeal unless the practice can document a valid exception, such as a system error on Aetna’s end or a documented coordination-of-benefits delay.
Does Aetna’s timely filing limit apply to corrected claims too?
Corrected claims and resubmissions generally follow a separate window, often around 180 days from the date of the original denial, distinct from the initial claim’s filing deadline.
How is the timely filing deadline calculated?
From the date of service to the date Aetna actually receives the claim, not the date it was submitted from the practice’s system or clearinghouse.
What OmniBridge Actually Does
We track submission and resubmission deadlines by payer and plan as part of our medical billing service for independent physician practices, so a claim never sits long enough to become an unrecoverable timely filing denial.
If you want to know how many of your denials over the last year were timely filing issues that could’ve been prevented, request a free practice audit and we’ll pull the numbers.
