Most people think of Medicare as a program for people 65 and older. But about 9 million Americans under 65 are enrolled in Medicare because of a disability or specific medical condition. If you or someone you know is under 65 and receiving Social Security Disability Insurance (SSDI), Medicare may be coming — but the path to eligibility involves a waiting period that surprises many people.
How you qualify for Medicare under 65
There are three ways to become eligible for Medicare before age 65:
- Social Security Disability Insurance (SSDI) — the most common path; requires a 24-month waiting period from when you become entitled to SSDI benefits
- Amyotrophic Lateral Sclerosis (ALS) — Medicare coverage begins the same month SSDI disability benefits begin; the 24-month waiting period is waived
- End-Stage Renal Disease (ESRD) — permanent kidney failure requiring dialysis or a kidney transplant; Medicare usually begins the 4th month of dialysis or sooner if you receive a transplant
The 24-month SSDI waiting period
If you qualify for Medicare through SSDI, you must wait 24 months from your SSDI benefit entitlement date — not from when you first applied or when you were approved. The entitlement date is typically the date your benefits began, which itself follows a 5-month waiting period from the onset of disability.
In practice, this means the total wait from the onset of disability to Medicare coverage is often 29 months or longer:
- 5-month SSDI waiting period from disability onset to when benefits begin
- 24-month Medicare waiting period from when SSDI benefits begin
During this waiting period, you need other health coverage — COBRA, a spouse’s plan, or an ACA Marketplace plan (and at income levels below 400% FPL, you may qualify for significant subsidies). Medicaid is also available for people with very low income, and it can work alongside Medicare once you become eligible.
What Medicare covers for disabled beneficiaries under 65
Once you’re enrolled, Medicare works the same for people under 65 as it does for those 65 and older. You get the same Parts A, B, C, and D. The same coverage rules, the same cost-sharing, the same enrollment choices.
A few things to know:
- You are automatically enrolled in Medicare Part A and Part B after 24 months of SSDI (you receive a Medicare card in the mail; you can decline Part B if you have other coverage, but the late enrollment penalty applies if you delay without creditable coverage)
- You can enroll in a Medicare Advantage plan or keep Original Medicare — the same choice as at 65
- You can enroll in a Part D drug plan
- You can buy Medigap — but insurers in most states can use medical underwriting for people under 65 (see the Medigap section below)
ESRD: Medicare for kidney failure
If you have permanent kidney failure and require ongoing dialysis or have had a kidney transplant, you qualify for Medicare regardless of age. Coverage typically begins the 4th month of regular dialysis treatment (or sooner if you do home dialysis training). If you receive a kidney transplant, Medicare begins the month of the transplant.
For ESRD beneficiaries, Medicare Advantage is available (it was not allowed for ESRD until 2021). As with other beneficiaries, choosing between Original Medicare and Medicare Advantage involves the same tradeoffs.
ALS: Medicare with no waiting period
ALS (Lou Gehrig’s disease) is one of the few conditions for which Congress eliminated the 24-month Medicare waiting period. Medicare begins the same month that SSDI benefits begin for ALS. Given the rapidly progressive nature of ALS, the standard 2-year wait was recognized as incompatible with the disease’s trajectory.
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Medigap for people under 65
Medigap is available to disabled Medicare beneficiaries under 65, but there’s a significant caveat: most states allow insurers to use medical underwriting for people under 65, meaning they can deny coverage or charge higher premiums based on health conditions. This is different from the guaranteed issue rights that apply to most people at 65.
However, some states require insurers to offer at least one Medigap plan to Medicare beneficiaries under 65 at standard rates:
- California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Kansas, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, New Hampshire, New Jersey, New York, North Carolina, Oklahoma, Oregon, Pennsylvania, South Dakota, Tennessee, Texas, Vermont, Virginia, Washington, and Wisconsin have varying requirements
The rules vary significantly by state. Check your state’s rules before assuming Medigap isn’t available or affordable. A licensed insurance agent in your state can provide current information.
Medicare Savings Programs for disabled beneficiaries
Medicare Savings Programs (state programs that help pay Medicare premiums and cost-sharing) are available to disabled Medicare beneficiaries under 65 who meet the income and asset criteria, not just those 65 and older. If you have Medicare through SSDI and have limited income, check your eligibility for these programs — they can significantly reduce your out-of-pocket Medicare costs.
What happens at 65?
When a disabled Medicare beneficiary turns 65, their Medicare coverage transitions automatically. The SSDI-based Medicare becomes age-based Medicare — the benefits stay the same, but the source of eligibility changes. This transition opens a new Medigap Open Enrollment Period in most states, giving disabled beneficiaries who couldn’t get Medigap at standard rates under 65 a fresh guaranteed-issue window at 65.
If you’ve been on SSDI-based Medicare and have been unable to get affordable Medigap, turning 65 is your opportunity to enroll in a Medigap plan with full guaranteed-issue rights. Don’t miss this window.
Bottom line
Medicare is available under 65 through SSDI (after a 24-month wait), ALS (no wait), and ESRD (dialysis or transplant). The coverage is the same as at 65. The main complications are the waiting period itself and the limited Medigap access in most states for people under 65. If you’re in the waiting period, plan for coverage using COBRA, a spouse’s plan, or an ACA Marketplace plan. And when you turn 65, use the new Medigap enrollment window if Medigap is something you want.
🆓 Questions about Medicare through disability?
Our partner Chapter Medicare offers free guidance from licensed advisors who specialize in Medicare. They can walk through your options and help you find the best coverage for your situation.
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Disclosure: We may receive a referral from Chapter if you choose to use their service. Chapter is a licensed health insurance agency and is not affiliated with or endorsed by Medicare or any government agency.
Further Reading
- Medicare Parts A, B, C, and D Explained
- Medicare Costs and Premiums
- Medicare Savings Programs
- Medigap / Medicare Supplement Insurance Explained
- Medicare Enrollment
- Health Coverage Before Medicare
This article is for general educational purposes only and does not constitute insurance or financial advice. Visit medicare.gov or contact 1-800-MEDICARE, or consult a licensed advisor for guidance specific to your situation.
