Getting approved for Social Security Disability Insurance (SSDI) is a big step, and health coverage is often the next question. Medicare starts after you've been entitled to SSDI for 24 months, so it begins in month 25, according to the Social Security Administration (SSA). You're enrolled automatically, so you don't need to apply. People with amyotrophic lateral sclerosis (ALS) or kidney failure can get Medicare sooner.
When does Medicare start after SSDI?
Medicare starts in your 25th month of SSDI entitlement. "Entitlement" means the months Social Security says you're owed a disability payment. As of 2026, the qualifying period is 24 months. The SSA page on Medicare for SSDI beneficiaries explains the rule.
The count starts with your first month of entitlement. That's usually a different date from the day your health changed and from the day you were approved.
That first month comes after SSDI's five-month waiting period. The waiting period starts when your disability does, as the SSDI Five (benefitsusa.org) and SSA's Medicare qualifying period page describe. Add the two together, and most people reach Medicare about 29 months after they became disabled.
Do people with ALS or kidney failure have to wait 24 months?
No. Two conditions follow different rules. The Centers for Medicare & Medicaid Services (CMS) page on Part A and Part B eligibility lays them out.
Situation | When Medicare usually starts | Do you sign up yourself? |
|---|---|---|
Most SSDI conditions | Your 25th month of SSDI entitlement | No, it's automatic |
ALS (also called Lou Gehrig's disease) | The month your SSDI benefits begin | No, it's automatic |
Kidney failure, also called end-stage renal disease (ESRD) | Usually the fourth month of dialysis, sometimes sooner | Yes |
ALS: With ALS, there's no 24-month wait. Medicare Part A and Part B start the same month your disability benefits do.
Kidney failure: ESRD is kidney failure that needs regular dialysis or a transplant. Medicare can start without the 24-month wait, but it isn't automatic. You have to sign up. Coverage can begin earlier if you train for home dialysis or get a transplant. Your work history matters too. You, your spouse, or a parent needs enough work under Social Security. The SSDI Five (benefitsusa.org) explains these timing rules.
Do I need to sign up for Medicare after SSDI approval?
Most people don't need to sign up. According to the SSA page on Medicare for SSDI beneficiaries, you're enrolled in Part A and Part B automatically after 24 months of entitlement.
- Part A is hospital insurance. It covers inpatient hospital stays and some skilled nursing care.
- Part B is medical insurance. It covers doctor visits, outpatient care, and medical equipment.
The SSDI Five (benefitsusa.org) says your Medicare card arrives in the mail about three months before your coverage starts. That gives you time to plan.
Part B has a monthly premium. For most people on SSDI, the SSA booklet explains, it comes out of the monthly payment. That changes the deposit you see, so it helps to know how your SSDI amount is figured. You can turn Part B down if you have other coverage. The mailing that comes with your card explains how.
Drug coverage works on its own track. Medicare Part D covers prescriptions, and you choose a plan yourself. You can also choose a Medicare Advantage plan (Part C) instead of Original Medicare. Check the SSDI Five (benefitsusa.org) for when your window to pick a plan opens.
When does the 24-month waiting period start counting?
The count starts in the first month SSA says you're entitled to benefits. Your award letter from Social Security shows that date. Here's how the math works for one person.
Say Marcus became disabled on October 15, 2025. The months count like this:
Step | Marcus's dates |
|---|---|
Disability begins | October 15, 2025 |
Five-month waiting period | November 2025 through March 2026 |
First month of SSDI entitlement | April 2026 |
24 months of entitlement | April 2026 through March 2028 |
Medicare card arrives (about 3 months ahead) | Around January 2028 |
Medicare starts | April 2028 |
This is an example, not a prediction. Your own dates depend on your award letter.
A long wait for approval can actually work in your favor here. Your entitlement can start months before SSA approves your claim, and the 24-month count runs from entitlement, not approval. If Marcus isn't approved until 2027, his 24 months were still counting from April 2026. By the time he's approved, much of the wait may be behind him. The same early start date is also why SSDI back pay can cover months before your approval.
How can I get health insurance while I wait for Medicare?
The 24-month gap is real, and it's hard for a lot of people. Most people bridge it with one of these options:
Option | Who it may fit | What to know |
|---|---|---|
Medicaid (state health coverage for low-income people) | People with low income and few assets | Income and asset limits vary by state |
Affordable Care Act (ACA) Marketplace plan (coverage you buy) | People who don't qualify for Medicaid | Lower income can mean a lower premium |
COBRA (keeping your former job's health plan) | People who had coverage through work | You usually pay the full cost yourself |
A spouse's plan | People with a spouse who has job-based coverage | Check that plan's enrollment rules |
Medicaid rules vary a lot by state. If you also get Supplemental Security Income (SSI), many states give you Medicaid too. Some people qualify for both Medicaid and Medicare once their Medicare begins.
For guides on applying for benefits where you live, browse Radar, Turnout's free benefits scan.
What this means for you
You don't have to solve the whole timeline today. Here are the steps in order.
- Find your entitlement month. Look on your SSA award letter for the month your benefits began.
- Count forward 24 months. The next month is when Medicare should start.
- Watch your mail. Your card should come about three months before that month.
- Cover the gap now. Check Medicaid, a Marketplace plan, COBRA, or a spouse's plan.
- Plan for drug coverage. Pick a Part D plan when your window opens.
If you want to see where Medicare fits among your other SSDI milestones, our SSDI and SSI benefits timeline walks through them in order. Once Medicare starts, you may also have access to a healthcare advocate. Here's how Medicare can cover healthcare advocacy.
FAQ
I get SSI, not SSDI. Will I get Medicare?
SSI alone doesn't lead to Medicare. SSI is tied to Medicaid in many states, which works on a different timeline. If you get both SSI and SSDI, the 24-month Medicare rule still applies to your SSDI.
Will I lose Medicare if I go back to work?
Usually not right away. SSA's work incentive rules often let Medicare continue for a long time after you return to work. Ask SSA how your earnings affect your coverage before you start a new job.
Do I have to keep Part B?
No. You can turn it down if you have other coverage, such as a plan through a working spouse. If you drop Part B without other qualifying coverage, the SSA booklet notes you may pay a higher premium when you sign up later.
What happens to my Medicare when I turn 65?
Your Medicare coverage keeps going. At full retirement age, your SSDI switches over to Social Security retirement benefits. Here's more on when SSDI ends and what replaces it.
Turnout is not a law firm and does not provide legal or tax advice.
It's your turn
The 24-month wait is the time to line up every benefit that fits your situation. Run Turnout's free benefits scan to see which programs you may qualify for in your state. If you'd rather talk it through with a person, our Social Security disability advocates can work with you one-on-one.
Already have your SSD benefits? Talk to a Turnout Healthcare Advocate to talk it through – it's covered by Medicare.