Is the 180-day appeal window the same for every plan?

No. One hundred eighty days is a federal floor or common ACA internal-appeal window for many commercial plans, not a universal rule. Medicare, Medicaid, Tricare, and some fully insured state plans print different clocks. A shorter date on your notice still controls filing unless federal law gives you a longer window for your plan type. Never assume your neighbor's ERISA timeline applies to your Medicare or Medicaid case.

How long do Medicare enrollees have to appeal a denial?

It depends on the Medicare track. Medicare.gov currently instructs Medicare Advantage and Part D enrollees to file a Level 1 appeal within 65 days from the date on the initial denial notice. Original Medicare Part A and Part B redeterminations use the deadline printed on the Medicare Summary Notice, often 120 days from receipt of the initial determination. Later Medicare levels use separate clocks, including 60-day windows for Part D Independent Review Entity reconsideration after a plan upholds a denial and for some Office of Medicare Hearings and Appeals stages.

How long do I have after an internal appeal to request external review?

Healthcare.gov states that you must file a written external-review request within four months after the date you receive the insurer's notice or final determination that the claim was denied. Your final internal-appeal letter should explain how to request external review. State and federal tracks differ. Follow the instructions on that letter rather than a generic template.

What if my denial letter lists fewer than 180 days?

Keep the letter and confirm your plan type on your Summary Plan Description, Marketplace enrollment documents, or Medicare card. For many ACA and ERISA health claims, 180 days is a federal floor. If the notice is shorter than the floor that applies to your plan type, file as soon as you can and note the mismatch in your appeal. If the notice gives you more time, use the longer date on the notice.

Does the clock start when I received the letter or when it was dated?

It depends on the program. Healthcare.gov's 180-day ACA internal-appeal window runs from receiving notice of the denial. Medicare Advantage and Part D Level 1 instructions on Medicare.gov count from the date on the initial denial notice. ERISA plans generally start from receipt unless your Summary Plan Description says otherwise. Use the rule named on your notice and keep the envelope or portal timestamp when receipt matters.

Can I appeal after the deadline passes?

Sometimes, but do not count on it. Medicare describes a good-cause process for late filings in limited situations. Commercial plans may accept a late appeal at their discretion. File on time whenever possible. If you are late, explain the delay in writing, attach evidence, and send the appeal the same day rather than waiting for verbal confirmation.

Is a prior-authorization denial on the same clock as a claim denial?

Often yes for commercial internal appeals. A refused authorization is a coverage decision you can appeal, and Healthcare.gov's 180-day filing window applies to receiving notice that coverage was denied. The plan's time to decide your appeal is shorter when you have not received the service yet. Healthcare.gov lists 30 days for many pre-service appeals and 60 days for post-service appeals. Medicare Part D coverage determinations and Medicaid managed-care appeals use their own notices.

How Long Do You Have to Appeal a Health Insurance Denial?

Q: How long do you have to appeal a health insurance denial?

Read the deadline on your denial notice first. ERISA employer group plans must give you at least 180 days to file an internal appeal under federal claims procedure rules. Healthcare.gov states that ACA-covered plans require an internal appeal within 180 days of receiving notice that the claim was denied. Medicare Advantage and Part D Level 1 appeals currently use a 65-day window from the date on the initial denial notice per Medicare.gov. Original Medicare redeterminations use the deadline on the Medicare Summary Notice, often 120 days from receipt. Medicaid and state-regulated plans use their own notices.

By AppealFlow editorial•11 min read•Published August 2026•Updated September 2026

Calendar diagram showing ERISA 180-day, ACA notice, and Medicare 60- to 65-day health insurance appeal deadline tracks from a denial letter

The appeal deadline is printed on your denial notice, not a single national number. ERISA employer plans must give you at least 180 days to file an internal appeal. Healthcare.gov states ACA-covered plans require an internal appeal within 180 days of receiving the denial notice. Medicare uses separate clocks, including 65 days for many Medicare Advantage and Part D Level 1 appeals and 60-day windows at later Medicare levels. Circle the date on your letter and file before it passes.

What Deadline Does Your Denial Notice Actually Control?

Key Takeaway: Your filing clock starts from the program that denied you, not from a blog post. ERISA employer coverage, ACA marketplace or group plans, Medicare, and Medicaid each print different rules. The date circled on your letter beats a generic “180 days for everyone” assumption.

A health insurance appeal is a written request to overturn a coverage or payment denial. The insurer must tell you how to appeal and how long you have. That information appears on your Explanation of Benefits, adverse benefit determination, or Medicare Summary Notice. If you only heard about the denial by phone, ask the plan to send the written notice with the appeal address or portal link.

Missing the filing window can end your rights at that appeal level. You may still have other options such as a corrected claim, a grievance, or a state insurance department complaint, but those are not substitutes for a timely appeal. Start by identifying whether the denial came from an ERISA employer plan, an ACA-regulated commercial plan, Medicare, or Medicaid. Then match that program to the table below before you draft a letter.

Which Appeal Clock Applies to Your Plan Type?

Key Takeaway: Federal floors and Medicare clocks do not swap. A sentence that works on an ERISA appeal letter can be wrong on a Medicare Advantage notice. Read the document in your hand, then verify it against the primary source for your program.

System	Typical pattern	Never say
ERISA employer group health	At least 180 days to file an internal appeal from notice of denial. Check the Summary Plan Description if the plan allows longer.	“You always have 180 days.”
ACA marketplace / individual / many group plans	Internal appeal within 180 days of receiving notice of denial. External review within four months after the final internal determination.	“Same as ERISA in every detail.”
Medicare Advantage / Part D (Level 1)	65 days from the date on the initial denial notice per Medicare.gov plan-appeal instructions	“Medicare works like commercial insurance.”
Original Medicare (Part A/B redetermination)	Deadline printed on the Medicare Summary Notice, often 120 days from receipt of the initial determination	“Medicare always gives you 60 days.”
Medicare later levels (Part D IRE, OMHA, Council)	Separate 60-day filing windows on the specific decision notice for that level	“One Medicare deadline for every level.”
Medicaid	State fair hearing and managed-care plan appeal clocks on the state or MCO notice	A national Medicaid deadline

Sources to verify before you file: DOL claims-and-appeals publication for ERISA plans, Healthcare.gov internal appeals for ACA plans, and Medicare.gov claims and appeals for Medicare tracks. For Medicaid, use your state agency notice and see how to appeal a Medicaid denial.

How Long Do ERISA Employer Plans Have to Accept Your Appeal?

Key Takeaway: Job-based coverage governed by ERISA must give you at least 180 days to appeal an adverse benefit determination. That is a federal floor under claims procedure rules, not a promise every denial letter will print the correct date.

The Department of Labor's claims publication tells participants they have at least 180 days to file an appeal and to check the Summary Plan Description if the plan allows more time. After you file, the plan must decide urgent pre-service appeals within 72 hours of receiving your request and standard appeals within shorter decision clocks that differ for care you have or have not yet received.

If your employer plan uses two internal levels, each level generally gets half the usual decision time. You receive a reasonable period to escalate to the next level, not a fresh 180-day filing window. For the full workflow after a claim denial, see what to do when an insurance claim is denied.

What Is the ACA Internal Appeal Window on Your Notice?

Key Takeaway: Healthcare.gov states you must file an internal appeal within 180 days of receiving notice that the claim was denied. Your notice may also print a calendar date. Use whichever rule applies to your plan type and keep proof of when you received the letter.

Healthcare.gov's appeal overview explains that if your insurer refuses to pay a claim or ends coverage, you can appeal and have the decision reviewed. The same site's internal-appeals page sets the 180-day filing window from receipt of the denial notice.

Situation	Typical federal pattern	Source to verify
Your time to file an internal appeal	180 days from receiving the denial notice	Healthcare.gov internal appeals
Plan decides a pre-service appeal	30 days if you have not received the service yet	Healthcare.gov internal appeals
Plan decides a post-service appeal	60 days if you already received the service	Healthcare.gov internal appeals
Your time to request external review	Four months after the final internal determination	Healthcare.gov external review

Filing time and decision time are different clocks. You must meet the notice deadline to open the appeal. The plan then has its own shorter window to respond. When internal review ends, see how to request external review for the next step.

Need a Draft Before the Deadline?

AppealFlow drafts a letter that names the denial date and the facts you enter. You still file on the portal or address printed on the notice before that clock runs out.

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What If Medicare or Medicaid Denied the Claim Instead?

Key Takeaway: Medicare and Medicaid print their own deadlines. Do not cite ERISA 180-day rules or ACA Section 2719 on a Medicare Summary Notice or state Medicaid fair-hearing letter.

Original Medicare, Medicare Advantage, and Part D each use different notices and forms. Medicare.gov currently instructs Medicare Advantage and Part D enrollees to file a Level 1 appeal within 65 days from the date on the initial denial notice. Original Medicare redeterminations follow the deadline on the Medicare Summary Notice. Several later Medicare levels use 60-day windows on their decision letters, including Part D Independent Review Entity reconsideration when a plan upholds a denial.

The full Medicare walkthrough, including CMS-20027 and plan-specific steps, is in how to appeal a Medicare denial. Medicaid eligibility and managed-care denials use state fair hearings with clocks on the state notice. A hospital status change from inpatient to observation uses a separate fast-appeal notice, covered in what hospital observation status is.

How Do You Calculate the Date So You Do Not Miss It?

Key Takeaway: Write down the notice date, the receipt date if the rule is receipt-based, and the filing method the letter names. Portal upload, fax, and mail have different filed moments. Keep the envelope or the portal confirmation.

Circle the appeal-by date on the denial and put a reminder on your calendar three days earlier
Confirm plan type on your ID card, Marketplace plan documents, Medicare card, or Medicaid enrollment letter before you rely on a federal floor
If the letter is shorter than the federal floor for your plan type, file anyway and quote the federal source in your appeal
Urgent care uses a faster decision clock. See how to request an expedited appeal

Do not wait for a peer-to-peer slot. A clinician call does not pause the written-appeal deadline. File the appeal, then take the call if offered.

Weak vs. Strong Language About the Deadline

Key Takeaway: Name the notice date, the program, and the rule you are using. “I still have time” is not a filing date.

❌ Weak Request	✓ Strong Request
“I have 180 days like everyone else.”	“Denial dated [date], received [date]. This is an ACA-regulated claim. I file this internal appeal within 180 days of receipt per Healthcare.gov internal-appeals guidance. Claim #[number].”
“My old job plan had 180 days, so Medicare does too.”	“This is a Medicare Advantage notice dated [date]. I am filing Level 1 within 65 days of that notice date per Medicare.gov, not under ERISA 180-day rules.”
“The insurer has 60 days, so I can wait two months to appeal.”	“I am filing my member appeal today, [date], within the [180-day / 65-day / notice] window. The plan's 60-day decision clock starts after you receive this appeal, not before.”

Frequently Asked Questions

Filing windows for ERISA, ACA, Medicare, Medicaid, and external review after an internal denial.

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Disclaimer: This article is for educational purposes only and does not constitute medical, legal, or financial advice. AppealFlow.net is not a healthcare provider, insurance broker, or law firm. Appeal clocks differ by plan and program. Verify the date on your notice, Healthcare.gov, DOL, Medicare.gov, or your state Medicaid agency before you file. For medical emergencies, call 911. See our full disclaimer.