SSDI Recipients Must Enroll in Medicare After 24 Months

If you receive Social Security Disability Insurance (SSDI), you become automatically enrolled in Medicare Part A (hospital insurance) after you have been on SSDI for 24 consecutive months. This is not optional — the enrollment happens without you taking any action. You will receive a Medicare card in the mail about three months before your 24-month mark.

Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. You pay no monthly premium for Part A if you have worked long enough to may have access to for SSDI in the first place. However, you will still owe a deductible when you use hospital services, and costs vary depending on the length of your stay.

Part B (medical insurance) is different. You are not automatically enrolled in Part B, and you do not have to take it. Part B covers doctor visits, outpatient care, and some preventive services. If you want Part B, you must request it during your initial enrollment period, which begins three months before your 24-month SSDI anniversary and ends three months after. If you miss this window and do not enroll, you may face a permanent penalty on your Part B premium.

Key Takeaways

  • Medicare Part A enrollment is automatic after 24 months on SSDI and requires no action on your part.
  • Part B is optional and requires you to actively request it during your enrollment window or face a lifetime premium increase.
  • You can turn down Part B if you have other health coverage, but you must notify Social Security in writing.
  • Your Medicare card will arrive by mail; you do not need to visit an office or call to receive it.
  • If you are under 65 and on SSDI, Medicare is your primary insurance once you are enrolled, even if you have employer coverage.

What Happens at Your 24-Month Mark

Social Security tracks your SSDI start date automatically. At exactly 24 months, your status changes and Medicare enrollment begins. You will receive a notice from Social Security explaining that you are now enrolled in Part A, along with information about Part B and how to request it if you want it.

Your Medicare card will arrive separately, usually within two to three weeks of the notice. The card shows your Medicare number, which is different from your Social Security number. You will need this number for any doctor or hospital visit. If your card does not arrive within a month of your 24-month mark, contact Social Security at 1-800-772-1213 to request a replacement.

Your Part A coverage is effective on the first day of the month in which you reach 24 months on SSDI. If you reach 24 months on March 15, for example, Part A coverage begins March 1. This matters if you are planning surgery or other care — you may already be covered even if your card has not arrived yet.

Part B: Deciding Whether to Enroll

Part B is optional, but the decision carries real consequences. If you enroll during your initial enrollment period (three months before through three months after your 24-month mark), you pay the standard monthly premium, which changes each year. In 2024, the standard Part B premium is $164.90 per month, but this amount varies by income and changes annually.

If you do not enroll during this window and later decide you want Part B, you can still enroll during the general enrollment period (January 1 through March 31 each year). However, your premium will be permanently higher — an additional 10 percent for each full year you were may be able to access but did not enroll. If you were may be able to access for three years and did not enroll, your Part B premium will be 30 percent higher for life.

You can decline Part B if you have other health coverage through an employer or a family member's employer plan. If you do decline, you must notify Social Security in writing and keep proof of your other coverage. This protects you from the late-enrollment penalty if you later lose that coverage and want to enroll in Part B.

Part D (Prescription Drug Coverage) and Supplemental Insurance

Part D is prescription drug coverage, and it is separate from Part A and Part B. You are not automatically enrolled in Part D, and you must actively choose a plan during your initial enrollment period or during the annual open enrollment period (October 15 through December 7 each year).

If you do not enroll in Part D when you first become may be able to access and later want it, you will pay a permanent penalty on your premium — approximately 1 percent of the national average Part D premium for each month you were may be able to access but not enrolled. Unlike Part B, there is no separate late-enrollment period for Part D; you can only enroll during the annual open enrollment window or if you have a may have access to life event.

You may also want to consider a Medigap (supplemental insurance) plan, which covers costs that Medicare does not, such as copayments and coinsurance. Medigap is sold by private insurance companies, not by Medicare. You have the best rates and most plan options if you enroll in Medigap within six months of your Part B start date.

How SSDI and Medicare Affect Your Work and Earnings

Enrolling in Medicare does not change your SSDI benefits or your ability to work. You can continue to receive SSDI while working, as long as your earnings stay below the substantial gainful activity (SGA) limit. In 2024, the SGA limit is $1,550 per month for non-blind individuals and $2,590 for blind individuals, but these amounts change each year.

If your earnings exceed the SGA limit, your SSDI benefits will stop, but your Medicare coverage continues for at least 93 months (about 7.5 years) after your benefits end. This is called Medicare continuation, and it means you keep your coverage even if you are no longer receiving SSDI payments. After the 93-month period ends, you can keep Medicare if you pay the full premium yourself.

If you return to work and your earnings drop back below the SGA limit, you can request that your SSDI benefits restart without going through the full process process again. This is called a Ticket to Work protection, and it is part of a federal program designed to encourage SSDI recipients to attempt work.

If You Disagree With Automatic Enrollment

You cannot prevent automatic enrollment in Part A after 24 months on SSDI. Part A enrollment is mandatory for all SSDI recipients who reach the 24-month mark. However, you can decline Part B and Part D, and you can request that Social Security remove you from Part B if you enrolled and later change your mind.

If you want to decline Part B or Part D, you must submit a written request to Social Security. Contact your local Social Security office or call 1-800-772-1213 to request the form and instructions. Keep a copy of your request and any confirmation you receive, because you will need proof if you later want to enroll without facing a penalty.

If you believe Social Security made an error in your enrollment or your effective date, you can file a request for reconsideration with Social Security. You have 60 days from the date of the notice to request reconsideration. Social Security will review your case and send you a new decision in writing.

Frequently Asked Questions

Can I stay on my parent's health insurance instead of taking Medicare?

No. Once you are automatically enrolled in Medicare Part A at 24 months on SSDI, Medicare becomes your primary insurance. You cannot decline Part A. You can keep other coverage as secondary insurance, but Medicare will be billed first for any medical services you receive.

What if I turn 65 while I am on SSDI?

Your SSDI benefits automatically convert to retirement benefits at age 65, and your Medicare coverage continues without interruption. The amount you receive may change slightly, but your health insurance stays the same. You do not need to take any action or reapply.

Do I have to pay for Part A if I am on SSDI?

No. Part A has no monthly premium for SSDI recipients. You pay only when you use hospital services — a deductible for hospital stays and coinsurance for longer stays. The deductible amount changes each year.

What happens to my Medicare if my SSDI benefits stop?

Your Medicare coverage continues for at least 93 months after your SSDI benefits end, even if you are working and earning above the SGA limit. After 93 months, you can keep Medicare by paying the full monthly premium yourself, or you can let it end.

Can I choose a different Medicare plan after I am enrolled?

Yes. You can change your Part B, Part D, and Medigap plans during the annual open enrollment period (October 15 through December 7). You can also change plans if you have a may have access to life event, such as moving to a new state or losing other health coverage.