Medicare Advantage Eligibility Requirements Explained (2026)

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Most people assume Medicare is only for people 65 and older. In fact about one in ten beneficiaries is under 65, qualifying through disability rather than age — 6.9 million of them, according to CMS. Eligibility has also genuinely changed in recent years, particularly for people with kidney disease. Here’s exactly who qualifies for Medicare Advantage in 2026, through which pathway, and — the part most guides skip — when the coverage actually starts.

The Quick Answer

You can enroll in Medicare Advantage if you meet all of these conditions:

• You’re enrolled in both Medicare Part A and Part B
• You live in the specific plan’s service area
• You qualified for Medicare through one of the recognized pathways: age 65+, disability via SSDI, ALS, or ESRD (kidney failure)

A significant rule change: Medicare Advantage plans can no longer reject applicants because of an ESRD diagnosis. The 21st Century Cures Act amended the Social Security Act to let all Medicare-eligible people with ESRD enroll in Medicare Advantage plans beginning January 1, 2021, per the CMS Contract Year 2021 Medicare Advantage and Part D final rule.

How Many People Actually Qualify Without Being 65

Worth getting the number right, because it’s widely misquoted. CMS publishes average monthly enrollment in its Fast Facts, split between “Aged” and “Disabled”:

Year	Total Medicare	Aged (65+)	Disabled (under 65)
2023	66.5 million	59.0 million	7.5 million
2024	68.0 million	60.8 million	7.2 million
2025	69.4 million	62.4 million	6.9 million

The figures are reproduced exactly as CMS prints them, each rounded to one decimal place on its own, which is why the 2025 row adds up to 69.3 rather than the 69.4 total in the first column. We have left them as published rather than adjusting one to make the arithmetic tidy.

Two things stand out. First, the honest figure is 6.9 million, not the nine or ten million that gets repeated across the internet. Second, and more interesting: while Medicare as a whole grew by nearly three million people in two years, the under-65 disabled population fell in each of those years. Their share of the program dropped from roughly 11% to roughly 10%.

CMS marks the 2025 figures as preliminary and subject to change, so treat the exact number as a snapshot rather than a fixed value. The direction, across three years, is the part that isn’t noise.

Pathway 1: Turning 65

The most common path. Part A costs $0 for most people because they or a spouse paid Medicare taxes long enough while working — generally at least 10 years. If you didn’t, you can still buy Part A, at either $311 or $565 a month depending on how long you or your spouse paid in. Part B carries a standard premium of $202.90 a month in 2026 for nearly everyone, regardless of work history. All three figures are published on Medicare’s page on Medicare costs.

Your enrollment window is your Initial Enrollment Period (IEP) — a 7-month window centered on your 65th birthday. See our full Medicare enrollment periods guide for the complete timeline.

Pathway 2: Disability via SSDI

If you’re under 65, the most common route to Medicare is through Social Security disability benefits. Medicare’s page on getting Medicare before 65 puts the rule plainly: if you’re getting Social Security disability benefits, you get Medicare automatically after receiving those benefits for 24 months. Once that waiting period ends, everything opens at once, including the ability to enroll in Medicare Advantage.

A pathway that can shorten the wait indirectly: if your condition is on the Social Security Administration’s Compassionate Allowances (CAL) list — 314 conditions as of August 2026, including certain cancers, Down syndrome and rare neurological disorders — your disability claim can be fast-tracked. Note what this does and doesn’t do: it speeds up the approval, which moves your 24-month clock forward. It does not shorten the 24 months themselves.

Pathway 3: ALS (Amyotrophic Lateral Sclerosis)

ALS is the one clean exception to the 24-month rule. Medicare’s wording: if you have ALS, you get Medicare automatically as soon as you start getting disability benefits.

That phrasing matters more than it looks. The trigger is the first benefit payment, not the approval letter — those are different dates, and the gap between them is where people get caught planning around the wrong one. If you’re coordinating other coverage around a Medicare start date, the date to work from is when benefits actually begin.

Pathway 4: ESRD (End-Stage Renal Disease)

ESRD — kidney failure requiring dialysis or a transplant — is its own eligibility track, independent of disability benefits. Medicare’s ESRD page is the source for everything in this section.

• Age doesn’t matter. With ESRD you can get Medicare no matter how old you are, provided the other conditions are met.
• The work record can be someone else’s. You qualify if you’ve worked the required amount of time under Social Security, the Railroad Retirement Board or as a government employee — or if you’re already getting or eligible for those benefits — or if you’re the spouse or dependent child of someone who meets one of those requirements.
• Since January 1, 2021, no Medicare Advantage plan can turn you away for having ESRD. You can enroll in any plan available in your area.

The three-month gap nobody warns you about

Qualifying and being covered are not the same day, and with ESRD the distance between them is significant. For dialysis, Medicare coverage usually starts on the first day of the fourth month of your dialysis treatments. You begin dialysis in January; Medicare generally starts in April.

For a kidney transplant, the timing is different: coverage begins the month you’re admitted to a Medicare-certified hospital for the transplant.

That first gap is the one to plan around, because three months of dialysis is not a small bill to carry on whatever coverage you had before. It’s also the reason the coordination period below matters so much.

The 30-month coordination period, and why it can happen twice

If you have employer group health coverage, there’s a 30-month coordination period during which your employer plan pays first and Medicare is the secondary payer. After it ends, Medicare becomes primary.

The detail almost always left out: Medicare states there is a separate 30-month coordination period each time you sign up for Medicare based on permanent kidney failure. Someone who receives a transplant, leaves Medicare, and later returns to dialysis starts a new 30-month clock rather than continuing the old one. If that’s your situation, it’s worth confirming directly with Medicare which clock you’re on, since it determines who pays first for two and a half years.

For people with ESRD who also qualify for Medicaid, a Dual Eligible Special Needs Plan (D-SNP) is worth a specific look, since these plans are built to coordinate the two programs — see our Special Needs Plan guide.

Turning 65 When You Already Have Medicare Through Disability

Your coverage continues automatically. There’s no gap, no re-application, nothing lost. But one specific thing does change at 65, and it’s the single most valuable thing in this article for anyone who got Medicare early.

Your Medigap Open Enrollment Period opens at 65 — not when you first got Part B. Medicare defines that window as the 6-month period starting the first day of the month you’re 65 or older and signed up for Part B, on its page on when you can buy a Medigap policy. Both conditions have to be true. So someone who qualified for Medicare at 52 through disability has been enrolled in Part B for thirteen years without that window ever opening — and it opens on their 65th birthday month.

During those six months an insurer can’t refuse you a Medigap policy or charge you more because of your health history. After them, in most states, it can. For someone who has spent years on Medicare with a serious condition, that six-month window may be the only realistic chance they get at a Medigap policy, and it passes quietly.

Some states require insurers to offer Medigap policies to beneficiaries under 65 as well, so your state may give you rights that federal law doesn’t. Check your State Health Insurance Assistance Program before assuming either way — but if you’re approaching 65 on disability-based Medicare, put that window on your calendar now.

The Residency Requirement

Beyond your qualifying pathway, you must live in the specific plan’s service area. This is why Medicare Advantage availability varies so much by ZIP code — a plan that’s an excellent option in one county may not exist at all in the next one. Always confirm using the Medicare Plan Finder with your actual address, not a general search.

Income and Eligibility: A Common Misconception

Unlike Medicaid, Medicare eligibility is not based on income. You qualify through age or disability regardless of what you earn. Income affects your costs, not your access: beneficiaries above $109,000 a year individually, or $218,000 filing jointly, pay an Income-Related Monthly Adjustment Amount (IRMAA) added to their Part B and Part D premiums. The 2026 thresholds come from the CMS fact sheet on 2026 Part B premiums and deductibles.

Frequently Asked Questions

How many Medicare beneficiaries are actually under 65? 6.9 million, on an average monthly basis for 2025, out of 69.4 million total — about one in ten. Figures higher than that, including the frequently repeated “9 million”, don’t match what CMS publishes.

Can I enroll in Medicare Advantage if I have ESRD? Yes. Since January 1, 2021, plans cannot reject you because of an ESRD diagnosis, and ESRD qualifies you for Medicare at any age without needing disability benefits first.

How long do I wait for Medicare after being approved for disability benefits? 24 months of receiving benefits. ALS is the exception — coverage starts as soon as the benefits do. ESRD runs on its own separate track.

I start dialysis next month. When does Medicare actually begin paying? Usually the first day of the fourth month of your dialysis treatments, so plan for roughly three months on your existing coverage. If you’re admitted for a kidney transplant instead, coverage begins that month.

Does my income affect whether I’m eligible? No. Eligibility is based on age or disability, not income. Higher income raises what you pay through IRMAA; it doesn’t affect your right to enroll.

I got Medicare at 54 through disability. What changes at 65? Your coverage continues automatically, but your Medigap Open Enrollment Period opens for the first time — six months, starting the month you turn 65, during which no insurer can refuse you or price you on your health. It’s the one deadline on this list that never comes back.

Bottom Line

Eligibility is the easy half. Four pathways lead in — age, 24 months of disability benefits, ALS, and ESRD — and the rules for each are public and fairly clear.

What catches people is the timing attached to each one. ALS coverage starts with the first benefit payment, not the approval. ESRD dialysis coverage typically starts three months in, and the 30-month coordination clock can restart. And the Medigap window for anyone who came in through disability doesn’t open until they’re 65 — after which, in most states, it’s gone for good.

If you are not certain which pathway you came in on, or when your coverage actually starts, 1-800-MEDICARE can tell you from your own record, and a State Health Insurance Assistance Program counselor will talk it through at no charge. With that settled, the Medicare Plan Finder lists the plans open to you where you live.

Sources

• CMS Fast Facts — Centers for Medicare & Medicaid Services. Source for the average monthly enrollment figures for 2023, 2024 and 2025, split between Aged and Disabled, and for the note that the 2025 figures are preliminary.
• I’m getting Social Security benefits before 65 — Medicare.gov. Source for the 24-month disability waiting period and for ALS coverage beginning as soon as disability benefits start.
• End-Stage Renal Disease (ESRD) — Medicare.gov. Source for qualifying at any age, the spouse or dependent child work record, dialysis coverage starting the first day of the fourth month, transplant coverage starting the month of admission, and the 30-month coordination period repeating with each ESRD-based enrollment.
• Contract Year 2021 Medicare Advantage and Part D Final Rule (CMS-4190-F1) — Centers for Medicare & Medicaid Services. Source for the 21st Century Cures Act allowing all Medicare-eligible individuals with ESRD to enroll in Medicare Advantage plans beginning January 1, 2021.
• Medicare costs — Medicare.gov. Source for premium-free Part A after generally at least 10 years of Medicare taxes, the $311 and $565 Part A buy-in premiums, and the $202.90 standard Part B premium for 2026.
• When can I buy a Medigap policy? — Medicare.gov. Source for the Medigap Open Enrollment Period being the 6-month period that starts the first day of the month you are 65 or older and signed up for Part B.
• Compassionate Allowances — Social Security Administration. Source for the fast-tracked conditions list and its size as of August 2026.
• 2026 Medicare Parts A & B Premiums and Deductibles — Centers for Medicare & Medicaid Services. Source for the $109,000 individual and $218,000 joint IRMAA thresholds.

All figures and rules on this page were checked against the sources above on September 15, 2026.

Disclaimer: Eligibility rules and figures mentioned in this article reflect 2026 guidelines from the Centers for Medicare & Medicaid Services (CMS) and the Social Security Administration and are subject to change. Always confirm current details directly with Medicare.gov, the Social Security Administration, 1-800-MEDICARE, or a licensed agent before making a decision.