Answer
The short answer
Sometimes, and it depends entirely on the route. A Medicare Part D plan may extend for good cause if you ask in writing. Commercial plans have no such provision. Medicaid leaves it to your state.
Because these are three separate bodies of law that happen to use the same word. A commercial or employer plan runs on the federal claims-procedure regulation. Medicare Part D runs on its own part of the code. Medicaid runs on a federal floor with fifty state implementations on top of it.
They do not borrow from each other, and the differences here are not small. One of them has an explicit written extension procedure. One has nothing of the kind. One does not answer the question at all. Anyone who gives you a single answer to this question is giving you at least two wrong ones.
Yes, and it is written down. If you show good cause, the plan may extend the time for filing a redetermination. You have to ask in writing and say why the request was not filed on time. Note the verb: may, not must. This is the plan's discretion, exercised on a record you create.
Two mechanics before you conclude you are late at all. The sixty days runs from receipt of the written coverage determination, not from the date printed on it, and receipt is presumed to be five calendar days after that date unless there is evidence to the contrary. That is where the sixty-five days you see on the government's consumer page comes from. Count from the later date before you decide you have missed anything.
At the next level up, the independent review entity, the regulation says nothing about extending. That silence is a finding rather than a gap in our reading: we searched the whole subpart and the only good-cause provisions there are about vacating a dismissal, which is a different thing. What does exist is in the agency's published appeals guidance, which sets out an IRE good-cause extension requested in writing — and adds that the decision on whether to grant it is final and not subject to appeal.
The regulation does not say. Not in the section that grants the extension, and not anywhere else in that part — we looked. The criteria plans actually apply come from the agency's published guidance, which lists examples and says plainly that the list is not exhaustive.
Read the examples below for what they have in common: they are all things you can evidence. A late filing argued from a document beats one argued from a feeling.
No. There is no provision in the claims-procedure regulation letting a claimant file an internal appeal late for illness, hardship or any other reason, and there is none in the external review rule either. We are stating that as an absence because we read both regulations looking for it.
Four things do exist, and three of them are more useful than people expect.
First, the window is a floor rather than a fixed number. The rule requires plans to allow claimants at least 180 days. A plan may allow longer, and your own plan document is where that is written.
Second, the clock runs from receipt of the notice, not from the date on it. Neither regulation defines receipt or gives a mailing presumption — we searched both — so this is not a license to invent extra days, but it does mean the date printed on the letter is not automatically day one.
Third, the external review window has two written rollovers of its own. Where there is no corresponding date four months later, the request is due on the first day of the fifth month — the regulation gives its own worked example: a notice received on October 30 makes the request due March 1. And where the last filing day is a Saturday, Sunday or federal holiday, it moves to the next day that is not.
Fourth, and most powerfully: if the plan is the one that broke the rules, its deadlines stop protecting it. A plan that fails to follow the required procedures is treated as having had its internal process exhausted, which for health coverage lets you go straight to external review. And if you take that route and the reviewer or a court rejects it, your internal appeal clock restarts — the rule says time periods for re-filing begin to run when you receive the plan's notice of that.
They do not answer it. The federal rule tells the state to allow a reasonable time not to exceed 90 days from the date the notice of action was mailed. That is a ceiling on state discretion, not a right you hold, and nothing in the federal subpart says what happens when the state's own window is missed.
We checked rather than assumed. Across the whole of the federal fair-hearing subpart the phrase good cause appears once, and it is about failing to turn up to a scheduled hearing — not about filing late. There is no late-filing provision for the managed care plan appeal either.
So whether a late Medicaid appeal can be accepted is a question of your state's law, and this page will not answer it for you. Your state's page here, if we have published one, carries that state's own filing rule and the document it came from.
Recount first, from the right start date and on the right route — that alone resolves a good share of it. Then file anyway, in writing, with the reason for the delay stated and whatever evidence supports it. On Part D that is exactly the procedure the regulation describes. On the other routes it costs nothing to have asked in a form somebody has to answer.
Nothing here predicts whether an extension will be granted, and nothing here is legal advice. What we can tell you is which rule governs your route and where to read it.
What to say on the phone
I am filing an appeal on the denial dated [date] and I believe it may be outside the filing window. Please confirm the date you consider my filing window to have started, and whether you are treating it as running from the date on the notice or from when I received it. If a late filing needs a good-cause request, please tell me where to send it in writing.
Ask which date they are counting from. On more than one route the answer is receipt rather than the date printed on the letter, and that difference is sometimes the whole question.
If something here decides anything for you, read the source rather than our summary of it. These are the documents we opened, and the month we opened them.
Medicare Part D has a written extension procedure. "If an enrollee or prescribing physician or other prescriber acting on behalf of an enrollee shows good cause, the Part D plan sponsor may extend the timeframe for filing a request for redetermination." The request "must— (i) Be in writing; and (ii) State why the request for redetermination was not filed on time."
42 CFR §423.582(c), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
The Part D clock runs from receipt, and receipt is presumed. A redetermination request "must be filed within 60 calendar days after receipt of the written coverage determination notice," and "The date of receipt of the coverage determination or at-risk determination is presumed to be 5 calendar days after the date of the written coverage determination or at-risk determination, unless there is evidence to the contrary." That presumption is why the government's own consumer page states the window as 65 days from the date on the notice.
42 CFR §423.582(b), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
The regulation governing the next level up says nothing about extending. It requires that you "must file a written request for reconsideration with the IRE within 60 calendar days after receipt of the written redetermination by the Part D plan sponsor," with the same five-day receipt presumption, and it contains no good-cause extension for a late filing. We searched the entire subpart: good cause appears four times in it, and three of those are about vacating a dismissal rather than extending a filing window.
42 CFR §423.600(a), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
The extension at that level exists in the agency's published guidance instead. "If a party misses the 65-day timeframe for requesting an IRE reconsideration, he or she may request a good-cause extension. The extension request must be filed with the IRE, in writing, and include the reason why he or she did not request a reconsideration timely." It adds a line worth knowing before you rely on it: "The decision by the IRE on whether to grant an extension for good cause is final and not subject to appeal." The same guidance carries the good-cause examples plans apply, including that "The party was seriously ill, which prevented a timely appeal," and states its list is not exhaustive.
Centers for Medicare & Medicaid Services, Parts C & D Enrollee Grievances, Organization/Coverage Determinations, and Appeals Guidance, effective July 2026 · source · read August 2026
For a commercial or employer plan the window is a minimum, not a fixed number. The plan must "Provide claimants at least 180 days following receipt of a notification of an adverse benefit determination within which to appeal the determination." We read the whole section looking for a provision allowing a claimant to file late for good cause, illness or hardship, and there is none.
29 CFR §2560.503-1(h)(3)(i), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
The external review window carries two written rollovers, and the regulation supplies its own worked example. "If there is no corresponding date four months after the date of receipt of such a notice, then the request must be filed by the first day of the fifth month following the receipt of the notice. For example, if the date of receipt of the notice is October 30, because there is no February 30, the request must be filed by March 1. If the last filing date would fall on a Saturday, Sunday, or Federal holiday, the last filing date is extended to the next day that is not a Saturday, Sunday, or Federal holiday."
45 CFR §147.136(d)(2)(i), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
If the plan breaks the rules, its deadlines stop protecting it, and a rejected attempt restarts your clock. A plan failing "to establish or follow claims procedures consistent with the requirements of this section" means "a claimant shall be deemed to have exhausted the administrative remedies available under the plan." And where a claimant takes that route and it is rejected, "the claimant has the right to resubmit and pursue the internal appeal of the claim," with the plan required to give notice within not more than ten days, and "Time periods for re-filing the claim shall begin to run upon claimant's receipt of such notice."
29 CFR §2560.503-1(l)(1) and 45 CFR §147.136(b)(2)(ii)(F)(2), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
For Medicaid the federal rules set a ceiling on the state and stop there. The agency "must allow the applicant or beneficiary a reasonable time, not to exceed 90 days from the date that notice of action is mailed, to request a hearings" — the typo is in the published text. We searched the entire federal fair-hearing subpart for a late-filing provision: the phrase good cause occurs once in it, in a rule about an applicant who "fails to appear at a scheduled hearing without good cause," which is a different subject. Whether a late Medicaid appeal can be accepted is therefore a question of state law that the federal regulation does not answer.
42 CFR §431.221(d), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
The Medicaid managed care plan appeal has its own window and no extension either. "Following receipt of a notification of an adverse benefit determination by an MCO, PIHP, or PAHP, an enrollee has 60 calendar days from the date on the adverse benefit determination notice in which to file a request for an appeal to the managed care plan." Note that this one runs from the date on the notice, with no receipt presumption. There is a protection if the plan slips: where it "fails to adhere to the notice and timing requirements," the enrollee "is deemed to have exhausted" the plan's process and "may initiate a State fair hearing."
42 CFR §438.402(c), Electronic Code of Federal Regulations, effective August 2026 · source · read August 2026
American GLP is not a law firm, an insurer, a government office or a clinician, and nothing here is legal or medical advice. This page describes what published rules say. Your own plan documents and your own notice govern your case, and rules change — check the sources before you act.