If you're on Social Security disability, Medicare is coming without an application, but not right away, and not with every decision made for you. This page explains the waiting period, the exceptions, what to do the day your Medicare card arrives, and what to do if it doesn't. For the bigger picture, including coverage until Medicare starts and what changes at 65, see our full guide to Medicare under 65 on disability.

How long do you have to be on disability before Medicare starts?

Medicare starts in your 25th month of Social Security Disability Insurance (SSDI) benefits. Because SSDI has its own 5-month waiting period, that is about 29 to 30 months after your disability began.

There are two clocks. First, Social Security requires a waiting period of 5 full calendar months before SSDI benefits start. A month only counts if you were disabled for the whole month. Second, Medicare Part A begins with your 25th month of entitlement to disability benefits. Your Social Security award letter shows the month your entitlement started, which is the date that matters.

A worked example

For example, imagine someone whose disability began on March 15, 2026. Here is how the dates would line up:

  1. March 2026: disability begins. March doesn't count toward the wait because it isn't a full month.
  2. April to August 2026: the 5-month SSDI waiting period.
  3. September 2026: SSDI entitlement begins. This is month 1 of the 24.
  4. June 2028: the Medicare welcome package and card arrive, and the 7-month window to choose a plan opens.
  5. September 2028: Medicare Part A and Part B start (month 25).
  6. December 2028: the 7-month window closes.

Real dates depend on your award, so always go by your own letter.

Do the 24 months have to be in a row?

No. Months from an earlier period of disability benefits can count toward the 24 if that period ended within the last 60 months, or 84 months for disabled widow(er)'s or childhood disability benefits. There is no time limit if the new disability is the same as, or directly related to, the earlier one. Months on disabled widow(er)'s benefits or childhood disability benefits count too, not only SSDI on your own work record.

Are there exceptions to the 24-month wait?

Yes, two: ALS and kidney failure.

ALS (Lou Gehrig's disease). There is no 5-month SSDI waiting period and no 24-month Medicare wait. You get Medicare automatically as soon as you start getting disability benefits.

End-Stage Renal Disease (ESRD). If your kidneys no longer work and you need regular dialysis or have had a kidney transplant, you can get Medicare at any age if you meet Social Security's work-history or benefit requirements. ESRD Medicare is not automatic. You sign up through your local Social Security office or by calling Social Security at 1-800-772-1213. For in-center dialysis, coverage usually starts on the first day of the fourth month of dialysis, and sooner in some home-dialysis and transplant situations. If you're approved because of ESRD, you can sign up for Part B without a late-enrollment penalty. If you also have a job-based group health plan, that plan pays first for a 30-month coordination period.

Do I have to sign up for Medicare if I'm on SSDI?

No. If your Medicare is based on SSDI or ALS, Social Security sets up Part A and Part B for you. Your welcome package and Medicare card are mailed about 3 months before your coverage starts.

Two things are not automatic. Prescription drug coverage is a separate choice, and so is whether to keep Original Medicare or move to a Medicare Advantage plan. Also note that SSI (Supplemental Security Income) on its own doesn't lead to Medicare. Medicare on disability comes from Social Security disability benefits based on a work record. If you get SSI, see how Medicare and Social Security work together.

What should I do when my Medicare card arrives?

Check the card, decide about Part B, choose your drug coverage within your 7-month window, and plan the end of your current coverage. In order:

  1. Check the card. Make sure your name and the Part A and Part B start dates match your award letter.
  2. Decide whether to keep Part B. If you keep the card, you keep Part B and pay its premium. To turn it down, you follow the instructions that come with the card and send it back. Whether you can delay Part B without a late-enrollment penalty depends on your specific situation, including whether you have group health coverage based on your own or your spouse's current employment. Employer size can also affect how Medicare coordinates with that coverage, so we check the details before you decide. A Part B penalty, once it attaches, generally stays with you for as long as you have Part B. It is not a one-time fee. For disability-based Medicare, a penalty from these years stops at 65.
  3. Choose prescription drug coverage. Your 7-month window runs from 3 months before your 25th month to 3 months after it. In that window you can join a stand-alone Part D drug plan or a Medicare Advantage plan that includes prescription drug coverage. Check every prescription by name and dose against the options you're considering.
  4. Plan the end of your current coverage. A Marketplace plan doesn't end on its own. You can report your Medicare start date up to 3 months ahead so it ends the day before. If Medicare starts after you elected COBRA, the plan is allowed to end your COBRA. In North Carolina, Medicaid expansion coverage ends once you have Medicare.
  5. Check for help with costs. If money is tight, Extra Help and Medicare Savings Programs can lower drug costs and pay the Part B premium. See help paying for Medicare.

What if my Medicare card hasn't arrived?

If your card hasn't come by the end of the first month of your 7-month window, contact Social Security at 1-800-772-1213. That is the point at which Social Security's own procedures call for following up on a missing card for someone enrolled automatically. Social Security starts by checking the mailing address it has on file, so have your current address ready. If you had a card and lost it, you can print an official copy from your Medicare.gov account or order a replacement by calling 1-800-MEDICARE.

What should I do while I wait for Medicare?

Keep health coverage in place for the whole gap. For most people that means COBRA, a Marketplace plan or Medicaid. COBRA can stretch from 18 to 29 months if Social Security finds you were disabled during your first 60 days of COBRA and you tell the plan in time. Losing job-based coverage also opens a Marketplace Special Enrollment Period. We compare the two in COBRA vs. Marketplace.

The Medicare timing on this page is federal, so it is the same in North Carolina, South Carolina and Tennessee. What differs by state is the coverage you can use while you wait. North Carolina has expanded Medicaid for adults 19 to 64, while South Carolina and Tennessee have not. Our guide to Medicare under 65 on disability lays out each state's options side by side.

Mistakes we see people make

  • Counting from the date they applied for SSDI. The 24 months count from your entitlement month on the award letter.
  • Treating "automatic" as "done." Drug coverage still has to be chosen, and the window closes 3 months after Medicare starts.
  • Mailing back the Part B card without checking. Unless you have qualifying coverage from current employment, that can mean a penalty and a gap.
  • Waiting on a missing card. If it hasn't arrived by the end of the first month of your window, call Social Security.
  • Assuming ESRD works like SSDI. With kidney failure, nothing happens until you sign up.

What to have ready before you talk to us

  • Your Social Security award letter, with your entitlement start date
  • Your Medicare card or welcome package, if it has arrived
  • Your current coverage and the date it ends
  • Your doctors, specialists and every prescription with the dose
  • Anyone who is helping you, so they can join the call

How The Jordan Insurance Agency helps

A licensed agent from The Jordan Insurance Agency will map your dates from your award letter, help you decide about Part B, and compare drug coverage and Medicare Advantage options against your actual doctors and prescriptions. We work by phone, by video, or in person at our office at 3540 Toringdon Way, Suite 200, Charlotte, NC 28277, Monday through Friday, 9 to 5 Eastern, at no cost to you. Call (704) 926-7565 or use the button below to schedule a Medicare review. You can also read more on our Medicare page or browse our Medicare questions answered.

Frequently asked questions

Can I get Medicare sooner than 24 months on disability?

Only in specific cases. With ALS, Medicare starts when your disability benefits start. With kidney failure, it can start around the fourth month of dialysis once you sign up. Earlier periods of disability benefits can also count toward the 24 months.

Will my Medicare card come with Part B already on it?

Yes. When Medicare is based on SSDI, Part A and Part B are both set up for you. If you keep the card, you keep Part B and pay its premium. To turn Part B down, follow the instructions that come with the card.

Do I pay a premium for Medicare on disability?

Part A has no monthly premium when your Medicare is based on SSDI. Part B has a premium. The 2026 standard amount is $202.90 a month. See how the Part B premium works.

Can I join a Medicare Advantage plan before my Medicare starts?

Yes. If you choose a plan in the 3 months before your 25th month, it starts the same day your Medicare does. If you choose during your 25th month or the 3 months after, it starts on the first day of the following month.

What happens to my Medicare if I go back to work?

Social Security's work rules let you test working. After a 9-month Trial Work Period, Medicare can continue for at least 93 months, with Part A still at no premium. Talk to Social Security before you change anything.

Reviewed and approved by Billy Jordan, Jr., licensed agent and President of The Jordan Insurance Agency.

Last reviewed: October 2026