My insurer said the appeal was untimely

The plan says your appeal missed the deadline. If your appeal was actually on time, this is very reversible. If it was late, there may still be an argument. Here is how to figure out which situation you are in.

First, get the deadline right

The window depends on plan type:

• ERISA group health: 180 days from the date of denial (29 CFR 2560.503-1(h)(3)(i))
• Marketplace individual: 180 days from the date of denial (45 CFR 147.136)
• Medicare Advantage: 60 days from the date of denial (42 CFR 422.582)
• Medicaid managed care: 60 days from the notice of adverse benefit determination (42 CFR 438.402)
• Grandfathered plans: varies by plan document

Was your appeal actually late

The plan's clock is calculated based on:

• Date on the plan's denial notice
• Date the plan received your appeal (not the date you mailed it)

Get out:

• The date on the plan's denial letter
• The USPS tracking record showing when your appeal was delivered

Count the days. Include the starting date if the regulation says "from the date." Do not include the day the appeal was received.

If the appeal was actually on time

Send a follow-up:

• Cite the specific regulation and window
• Attach the plan's denial letter showing the date
• Attach USPS tracking showing the delivery date
• Attach a copy of your appeal
• Demand the plan process the appeal on its merits

Sample opening: "Regarding my appeal of claim [claim number], your notice dated [date] stated the appeal was untimely. My appeal was delivered to your appeals office on [date] under USPS Certified Mail tracking [tracking number]. The date on your denial letter was [date]. That is [X] days, well inside the [180 or 60] day window under [regulation]. Please process the appeal on its merits."

If the appeal was actually late, arguments to try

Good cause. Under 29 CFR 2560.503-1 and equivalent CMS regulations, "good cause" for late filing may be recognized:

• Serious illness of the member or a close family member
• A natural disaster or emergency
• A death in the immediate family
• Misinformation from the plan itself about the deadline
• A defective denial notice that did not clearly state the appeal window

For Medicare Advantage, good-cause late filing is expressly allowed under 42 CFR 405.942 (though this section applies to fee-for-service Medicare, similar principles apply and Medicare Advantage plans have their own good-cause rules).

Defective denial notice. If the plan's denial notice did not clearly state your appeal rights and the deadline, the deadline may not start until you received compliant notice. Under 29 CFR 2560.503-1(g), the denial must include specific elements including the plan's review procedures and time limits.

Continuing violation. If the denial is part of a pattern (a series of denials for the same issue), the newest denial may still be timely even if earlier ones were not appealed.

What the insurer's likely response is

• Reversal of the timeliness bar if you show the delivery date was inside the window
• Acceptance under good cause if you documented one of the recognized reasons
• Upheld if none of the above applies

Documentation for good cause

If you argue good cause, include:

• Documentation of the illness, emergency, or event
• A short statement of how it prevented timely filing
• Any evidence of your attempts to file inside the window (a partial appeal draft, notes from a phone call)

When to escalate

Timeliness stonewalls are often DOI-complaint-worthy. State insurance departments do not like plans that dismiss timely appeals on procedural grounds. Include:

• The plan's denial saying untimely
• Proof of delivery inside the window
• The regulatory citation

When to hire a lawyer

If a plan repeatedly dismisses valid appeals as untimely on a large-dollar claim, and you have proof of timely filing, an ERISA attorney can send a demand letter that usually cuts through. See When to hire an ERISA attorney.