You get Medicare automatically after you have been on SSDI for 24 months

If you are approved for Social Security Disability Insurance (SSDI), you do not have to do anything separate to get Medicare. The Social Security Administration enrolls you in Medicare Part A (hospital insurance) and Part B (medical insurance) automatically after you have received SSDI benefits for 24 consecutive months. This happens whether you are 30 or 65.

The 24-month waiting period starts the month your SSDI benefit begins, not the month you applied. If Social Security approves your claim in June but your benefit is dated to March, the 24 months count from March. You will receive a Medicare card in the mail about three months before the 24 months end.

You pay the standard Part B premium, which is deducted from your SSDI check each month. In 2024, most people pay $164.90 per month, though the amount changes yearly and is higher if your income is above a certain threshold. Part A has no monthly premium for most SSDI beneficiaries.

Key Takeaways

  • Medicare enrollment is automatic after 24 months on SSDI; you do not need to sign up or contact anyone.
  • The 24-month clock starts when your SSDI benefit begins, which may be earlier than the month you were approved.
  • You receive both Part A (hospital) and Part B (medical) coverage at the same time, with Part B premiums deducted from your monthly SSDI payment.
  • If you also receive Supplemental Security Income (SSI), you may be covered by Medicaid instead of or in addition to Medicare, depending on your state.

What happens during the 24-month waiting period

While you wait for Medicare to begin, you have no automatic federal health coverage through SSDI alone. Many states cover SSDI beneficiaries under Medicaid during this 24-month gap, but coverage varies by state. Some states begin Medicaid the same month your SSDI starts; others have their own waiting periods or do not cover SSDI beneficiaries at all under Medicaid.

You can purchase coverage on the health insurance marketplace during this time, and you may be able to reduce your premium through a tax credit if your income is low enough. You should contact your state Medicaid office or use the marketplace at healthcare.gov to learn what is available where you live. Do not assume you have no coverage—many people do, but the rules differ by state.

If you also receive Supplemental Security Income (SSI) in addition to SSDI, most states automatically enroll you in Medicaid right away, which covers you during the 24-month wait and continues after Medicare begins.

How Medicare and Medicaid work together after month 24

Once Medicare begins, you have both Part A and Part B. Medicaid may continue as well, depending on your state and income. When both programs cover you, Medicaid is called your "secondary payer"—it covers costs that Medicare does not, such as copayments, coinsurance, and deductibles. This combination is often called "dual coverage" and significantly reduces your out-of-pocket costs.

Not all states continue Medicaid after Medicare begins. Some states drop Medicaid coverage once you turn 65 or once Medicare starts, whichever comes first. A few states cover you under Medicaid only if your income stays below a certain limit. Contact your state Medicaid office to confirm whether your coverage continues and under what conditions.

What Medicare Part A and Part B cover

Part A covers inpatient hospital stays, skilled nursing facility care (up to 100 days per benefit period), hospice, and some home health services. You pay a deductible for each hospital stay, which was $1,632 in 2024, but this amount changes yearly. After you meet the deductible, Medicare covers most of the cost.

Part B covers doctor visits, outpatient care, lab tests, imaging, and durable medical equipment such as wheelchairs or oxygen. You pay a monthly premium (deducted from your SSDI check), a yearly deductible (which was $240 in 2024), and then 20 percent of the cost of most services. If you have Medicaid as well, Medicaid usually covers your Part B deductible and coinsurance.

Neither Part A nor Part B covers dental, vision, hearing aids, or long-term custodial care in a nursing home. You can purchase separate coverage for dental and vision, or enroll in a Medicare Advantage plan (Part C) that may include these benefits, though usually with higher out-of-pocket costs.

Medicare Advantage and other plan choices

After Medicare begins, you can choose to stay in Original Medicare (Part A and Part B) or switch to a Medicare Advantage plan (Part C). Medicare Advantage is offered by private insurance companies and includes Part A, Part B, and usually Part D (prescription drug coverage) all in one plan. Many plans have $0 premiums in addition to your Part B premium, and some cover dental or vision.

The trade-off is that Medicare Advantage plans have networks—you must use doctors and hospitals in the plan's network, except in emergencies. If you travel frequently or have a doctor you want to keep, Original Medicare may be better because it works nationwide. You can switch between Original Medicare and Medicare Advantage once per year during the Annual Enrollment Period (October 15 to December 7).

You should also enroll in Part D (prescription drug coverage) if you choose Original Medicare. You can enroll during the same Annual Enrollment Period, or you may face a penalty if you wait. If you have Medicaid, it may cover your prescriptions, so check with your state before enrolling in Part D.

Work incentives and how they interact with Medicare

If you work while on SSDI, your benefits do not stop when ready. SSDI includes work incentives such as the Trial Work Period (nine months in a rolling 60-month window when you can earn any amount without losing benefits) and the Extended may be able to access Period (36 months after the Trial Work Period ends when you can still receive benefits if your earnings drop below the substantial gainful activity level).

Your Medicare coverage continues throughout the Trial Work Period and Extended may be able to access Period, even if your SSDI check stops. After Extended may be able to access ends and your SSDI benefits end due to work, you can keep Medicare for up to 93 months (about 7.5 years) by paying the Part B premium yourself. This is called Medicare continuation, and it is one of the most valuable work incentives available to SSDI beneficiaries.

If you lose SSDI benefits because your medical condition improved (not because of work), Medicare stops three months after your SSDI ends. If you lose benefits because of work, Medicare continues as described above. Understanding this difference is important if you are considering returning to work.

What to do if you have not received your Medicare card

Social Security mails your Medicare card about three months before your 24 months of SSDI end. If you do not receive it by the time your 24 months are up, contact Social Security at 1-800-772-1213 to confirm your address and request a replacement card. You can also create an account at ssa.gov and check your SSDI status and Medicare enrollment there.

Your Medicare coverage begins on the first day of the month after your 24 months end, even if you have not received your card yet. You do not need the card to use Medicare—doctors and hospitals can look up your coverage by your Social Security number. However, you should have the card for your records and to show providers if needed.

Frequently Asked Questions

Do I have to pay for Medicare if I am on SSDI?

Yes, you pay the Part B premium (about $165 per month in 2024), which is deducted from your SSDI check. Part A has no monthly premium for most SSDI beneficiaries. You also pay deductibles and coinsurance when you use services. If you have Medicaid as well, Medicaid often covers these costs.

What if I am denied SSDI—do I still get Medicare?

No. Medicare is tied to SSDI approval. If your claim is denied, you do not get Medicare through SSDI. You would need to purchase coverage through the marketplace or Medicaid if you meet your state's income limits. If you believe the denial was wrong, you can appeal.

Can I delay Medicare enrollment after 24 months on SSDI?

No. Enrollment is automatic and you cannot opt out. However, if you are still working and have employer health insurance, you may be able to delay Part B enrollment without penalty under the "Federal Employee Health Benefits" exception. Contact Social Security to discuss your specific situation.

Does Medicare cover mental health or substance use treatment?

Yes. Part B covers outpatient mental health visits and therapy. Part A covers inpatient psychiatric hospital stays. Substance use disorder treatment is covered as well. You pay your usual deductible and coinsurance. Some services may require prior authorization from Medicare.

What happens to my Medicare if my SSDI benefits end because I returned to work?

Your Medicare continues for up to 93 months after your SSDI ends, as long as you pay the Part B premium yourself. This is one of the strongest work incentives in the SSDI program. After 93 months, you would need to may have access to for Medicare another way, such as reaching age 65 or having end-stage renal disease.