How SSDI Automatically Connects You to Medicare

You become Medicare-may be able to access after you have been on SSDI for 24 months

If you receive SSDI (Social Security Disability Insurance), you do not have to do anything separate to join Medicare. After you have been receiving SSDI payments for 24 consecutive months, Medicare enrollment happens automatically. You will receive your Medicare card in the mail without submitting a form or calling anyone.

The 24-month waiting period starts the month your SSDI benefits begin, not the month you applied. If your benefits started in March 2022, your Medicare coverage would begin in March 2024. You do not need to be a certain age — Medicare may be able to access through SSDI applies to disabled workers of any age once the 24-month period ends.

Social Security will send you a notice about three months before your Medicare coverage starts. This notice tells you your Medicare number, explains your coverage options, and shows you how to access your Medicare account online.

Key Takeaways

Medicare enrollment is automatic after 24 months on SSDI; you do not submit an process or pay to join.
Your 24-month waiting period begins the month your SSDI payments start, regardless of when you applied.
You will receive your Medicare card by mail and a notice from Social Security three months before coverage begins.
Medicare Part A (hospital insurance) is free for SSDI recipients, but you must choose and pay for Part B (doctor visits) unless you want it deducted from your SSDI check.
If you are already on Medicaid when Medicare starts, both programs work together, with Medicare paying first.

What Medicare Parts you receive and what they cost

Part A (hospital insurance) is free. It covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. You pay nothing for Part A premiums because you have been paying into Social Security through payroll taxes.

Part B (medical insurance) covers doctor visits, outpatient services, lab work, and medical equipment. Part B has a monthly premium that is deducted from your SSDI check unless you choose to pay it separately. For 2024, the standard Part B premium is $164.90 per month, but the amount changes each year and may be different based on your income. You also pay a yearly deductible ($240 in 2024) and 20 percent coinsurance for most services after you meet the deductible.

Part D (prescription drug coverage) is optional and has its own monthly premium, which varies by plan. You choose a Part D plan during your initial enrollment period or during the annual enrollment period (October 15 to December 7). If you do not choose a plan and later want one, you may pay a penalty for each month you went without coverage.

You can also choose Part C (Medicare Advantage), which is an alternative to Original Medicare (Parts A and B). Medicare Advantage plans are run by private insurance companies and often include prescription drug coverage and dental or vision benefits. Costs and coverage vary by plan and location.

Your enrollment period and when you must choose a plan

Your Initial Enrollment Period is seven months long: three months before your Medicare coverage starts, the month it starts, and three months after. During this time, you can join Part B, Part D, or a Medicare Advantage plan without penalty.

If you do not join Part B during your Initial Enrollment Period and you do not have other creditable coverage (such as an employer plan), you will pay a permanent penalty of 10 percent of the Part B premium for each year you delayed. This penalty stays with you for life, even if you join later.

Part D has the same rule: if you go without creditable prescription drug coverage and later join a Part D plan, you pay a penalty of about 1 percent of the national average Part D premium for each month you were uninsured. This penalty also stays with you permanently.

After your Initial Enrollment Period ends, you can only change your coverage during the Annual Enrollment Period (October 15 to December 7 each year). Changes take effect January 1. If you miss this window, you are locked into your current plan until the next October.

How Medicare and Medicaid work together if you have both

Many SSDI recipients are also on Medicaid because their income is low. When you have both programs, Medicare is your primary payer — it pays first on all claims. Medicaid then pays what Medicare does not cover, including your Part B premium, deductible, and coinsurance.

This is called dual may be able to access status. Your state Medicaid program handles the coordination automatically; you do not need to tell either program about the other. However, you must stay enrolled in both to get the full benefit. If you lose Medicaid may be able to access (for example, if your income rises), you will owe the full cost of Medicare coinsurance and deductibles.

Some states offer special programs for dual-may be able to access people, such as Programs of All-Inclusive Care for the Elderly (PACE) or managed long-term care plans. Ask your state Medicaid office whether these programs are available in your area and whether you may have access to.

What to do if you do not receive your Medicare card

Social Security mails Medicare cards about two weeks before your coverage date. If you do not receive your card within a week of your coverage start date, contact Medicare directly at 1-800-MEDICARE (1-800-633-4227) or visit Medicare.gov to create an account and view your coverage information online.

You do not need your physical card to use Medicare. When you see a doctor or go to a hospital, you can give them your Medicare number (which is on your Social Security card or in your online Medicare account) or show them a printed copy of your coverage details from Medicare.gov.

If your card arrives with errors — such as a misspelled name or wrong date of birth — call Medicare when ready. Errors can cause claims to be denied or delayed.

How to manage your Medicare account and make changes

Create an account at Medicare.gov using your email address and password. Once logged in, you can view your coverage details, see your claims history, read your Medicare card, and find doctors and hospitals in your network.

If you need to change your Part B, Part D, or Part C plan, you must do so during your Annual Enrollment Period (October 15 to December 7). Log into your Medicare account, select "Change Coverage," and follow the steps. Changes take effect January 1.

If you move to a different state, your Medicare coverage continues, but your Medicaid coverage may change. Contact your new state's Medicaid office to understand what you are covered for in your new location. Your Medicare plan may also change if it is not available in your new state — Medicare will notify you and help you choose a new plan.

What happens to your SSDI check when Medicare starts

Your SSDI payment amount does not change when Medicare begins. However, your Part B premium (and any Part D premium you choose) will be deducted from your SSDI check each month unless you ask to pay separately.

For 2024, if your Part B premium is $164.90 per month and your SSDI check is $1,200, you will receive $1,035.10 after the deduction. The exact amount depends on the premium for your year and whether you have chosen a Part D plan.

If your SSDI check is very small (less than the Part B premium), Social Security will pay Medicare directly from general revenue, and your check will not be reduced further. This situation is rare but does occur.

Frequently Asked Questions

What if I turn 65 while I am on SSDI?

Your SSDI automatically converts to Social Security retirement benefits at age 65, but your Medicare coverage continues without interruption. Your payment amount may change slightly because retirement benefits are calculated differently than disability benefits, but you stay on the same Medicare plan.

Can I delay Medicare enrollment to avoid the Part B premium?

You can delay Part B, but you will pay a permanent 10 percent penalty on your premium for each year you waited. Part A (hospital insurance) is free, so there is no financial reason to delay it. Most people enroll in Part B during their Initial Enrollment Period to avoid the penalty.

Do I have to choose a Part D plan, or can I skip it?

Part D is optional, but if you go without creditable prescription drug coverage and later join, you pay a permanent penalty of about 1 percent of the national average Part D premium for each month you were uninsured. If you do not take prescription medications, you may choose to skip Part D, but confirm you have no other creditable coverage first.

What if my income increases after I start Medicare?

Your Medicare coverage does not change based on income. However, if your income rises above certain thresholds, you may pay higher Part B and Part D premiums (called Income-Related Monthly Adjustment Amounts, or IRMAA). You will receive a notice if this applies to you. If you lose Medicaid because your income is too high, you will owe the full cost of Medicare cost-sharing.

Can I switch from Original Medicare to Medicare Advantage or back?

Yes, but only during your Annual Enrollment Period (October 15 to December 7). You can switch from Original Medicare to Medicare Advantage, or from Medicare Advantage to Original Medicare, or change from one Medicare Advantage plan to another. Changes take effect January 1.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.