When Your Medicare Coverage Begins After You Start Receiving SSDI

Medicare starts automatically after you receive SSDI for 24 months

Once you have been receiving SSDI payments for 24 consecutive months, Medicare Part A (hospital insurance) and Part B (medical insurance) begin automatically. You do not need to sign up separately or pay an enrollment fee. Social Security will send you a Medicare card in the mail about three months before your 24-month mark arrives.

The 24-month waiting period is a federal rule that applies to everyone on SSDI, regardless of age or the reason for your disability. This means a 25-year-old and a 64-year-old both wait the same amount of time. The clock starts on the first day you receive an SSDI payment, not the day you applied or were approved.

If you are already on Medicare when you start SSDI, or if you turn 65 while waiting for your 24 months to end, your coverage does not change. You keep what you have and do not lose anything when the automatic enrollment happens.

Key Takeaways

• Medicare Part A and Part B start automatically after 24 consecutive months of SSDI payments; you do not need to take any action.
• The 24-month clock begins on your first SSDI payment date, not your approval date or process date.
• Social Security mails your Medicare card approximately three months before coverage begins, so you will have it in hand before you need it.
• If you turn 65 before your 24 months end, you become may be able to access for Medicare at 65 instead, and your SSDI coverage does not change.
• Part D (prescription drug coverage) does not start automatically; you must enroll separately or face a late-enrollment penalty.

What happens during the 24-month waiting period

During these 24 months, you are receiving SSDI but not yet covered by Medicare. If you need medical care, you may be covered by Medicaid instead, depending on your state. Medicaid rules vary widely — some states cover all SSDI recipients automatically, while others require you to meet additional income or resource limits. Contact your state Medicaid office or call 211 to find out what you have during the waiting period.

Some people have other insurance during this time: employer coverage through a spouse's job, coverage through a marketplace plan, or COBRA continuation coverage from a previous employer. If you do, keep it active. You can switch to Medicare when it starts, but letting other coverage lapse during the 24 months leaves you uninsured if you need care.

If you are uninsured and cannot afford coverage during the waiting period, look into programs in your state that help low-income people pay for medical care. Your local health department or 211 can point you toward options.

How the 24-month clock works if your SSDI stops and restarts

If your SSDI payments stop for any reason — a work trial, a medical improvement review, or a change in your circumstances — and then restart later, the clock resets. You begin counting 24 months from the date your payments restart, not from your original approval date. This can happen if you work and earn above the substantial gainful activity limit, then stop working and reapply.

There is one exception: if your SSDI stops because you are working but you are still within your trial work period, the 24-month clock does not reset. The trial work period allows you to test your ability to work without losing SSDI status. Once the trial work period ends and your SSDI actually stops, a new 24-month clock begins if you later return to SSDI.

Keep track of the date your SSDI payments actually begin. You can find this on your Social Security statement or by calling Social Security at 1-800-772-1213. Knowing this date tells you when to expect your Medicare card.

What to do when your Medicare card arrives

About three months before your 24-month mark, Social Security will mail your Medicare card to the address on file. The card shows your Medicare number and which parts of Medicare you have (usually Part A and Part B). Check the card for errors — if your name, date of birth, or number is wrong, call Medicare at 1-800-MEDICARE (1-800-633-4227) to report it.

Once you have your card, you can use it when ready at hospitals, doctors' offices, and other providers that accept Medicare. You do not have to wait for your coverage to officially start on your 24-month anniversary. Providers will know your coverage is active based on your Medicare number.

If you do not receive your card by the time your coverage should start, call Medicare at the number above. They can issue a replacement or provide a temporary number you can use while waiting for the card to arrive.

Enrolling in Part D and supplemental coverage

Part D (prescription drug coverage) does not start automatically when you turn 24 months into SSDI. You must enroll in a Part D plan yourself, either through Medicare.gov or by calling 1-800-MEDICARE. You have a limited window to enroll without penalty: you can sign up anytime during your initial enrollment period, which runs from three months before your Medicare start date through three months after.

If you miss this window and do not enroll in Part D, you will pay a late-enrollment penalty for as long as you have Medicare. The penalty is 1 percent of the national average Part D premium for each month you were not covered. This adds up quickly, so enroll during your initial enrollment period even if you do not take many medications.

You may also want to enroll in a Medigap (supplemental insurance) plan or a Medicare Advantage plan. These are optional and help cover costs that Medicare Part A and Part B do not pay. You have the best rates and easiest enrollment during your initial enrollment period, so compare plans before your Medicare start date.

Telling your doctors and providers about your Medicare coverage

Once your Medicare card arrives, bring it to all your medical appointments. Give the card number to your doctor's office, hospital, pharmacy, and any other provider you see. This ensures they bill Medicare instead of Medicaid or any other insurance you may have had during the waiting period.

If you were seeing providers through Medicaid during your 24-month wait, let them know that Medicare is now your primary insurance. Some providers accept both Medicare and Medicaid, while others may require you to switch. Call ahead to confirm that your current providers accept Medicare before your coverage starts.

If you have both Medicare and Medicaid (called "dual may be able to access"), Medicaid becomes your secondary insurance. This means Medicare pays first, and Medicaid covers some of the costs Medicare does not pay. You keep your Medicaid card and continue using both.

What happens if you turn 65 before your 24 months end

If you reach age 65 before you have been on SSDI for 24 months, you become may be able to access for Medicare at 65 based on age, not disability. Your coverage starts the month you turn 65 (or the month after, depending on your birth date). This means you do not have to wait the full 24 months.

When you turn 65, Social Security will automatically enroll you in Medicare Part A and Part B. You will receive your Medicare card in the mail just as you would if you were waiting out the 24-month period. Your SSDI payments continue at the same amount; they do not change when you switch to Medicare based on age.

You still need to enroll in Part D separately if you want prescription drug coverage. The same initial enrollment period rules explore: you can enroll anytime from three months before you turn 65 through three months after, without penalty.

Frequently Asked Questions

Does the 24-month wait start over if I have a work incentive trial?

No. If you are in a trial work period (a program that lets you test working while keeping SSDI), your 24-month clock keeps running. The clock only resets if your SSDI payments actually stop and you later restart them.

Can I get Medicare before 24 months if I have end-stage renal disease or ALS?

Yes. People with end-stage renal disease (ESRD) or amyotrophic lateral sclerosis (ALS) can get Medicare when ready when they start SSDI, without waiting 24 months. If you have either condition, contact Social Security to make sure your case is coded correctly so Medicare starts right away.

What if Social Security made a mistake and my 24-month date is wrong?

Call Social Security at 1-800-772-1213 and ask them to verify your SSDI start date. Bring your Social Security statement or award letter, which shows the date your payments began. If there is an error, Social Security can correct it and notify Medicare.

Do I have to pay premiums for Part A and Part B when I am on SSDI?

Part A has no premium for most people on SSDI. Part B has a monthly premium that is usually deducted from your SSDI payment automatically. The premium amount changes each year. If your income is very low, you may may have access to for help paying Part B premiums through a state program.

What if I cannot afford my Medicare costs after coverage starts?

Several programs help people on SSDI pay for Medicare premiums and out-of-pocket costs. These include the Medicare Savings Program, Medicaid (if you are dual may be able to access), and the Low-Income Subsidy program for Part D. Contact your state Medicaid office or call 1-800-MEDICARE to learn which programs you may be able to use.