Medicare Part B covers doctor visits and outpatient care, and SSDI recipients are enrolled automatically once they have been on SSDI for 24 months

When you have been receiving SSDI benefits for 24 consecutive months, you become covered by Medicare Part B without having to request it. Part B pays for visits to doctors, specialists, outpatient hospital services, diagnostic tests, and medical equipment like wheelchairs or oxygen. You do not pay a monthly premium for Part B if your income is below a certain threshold — in 2024, that threshold is $97,000 for a single person, though the exact amount changes each year.

The 24-month waiting period begins the month your SSDI payments start, not the month you applied. If you were approved retroactively — meaning the SSA determined your disability began in an earlier month — your 24 months counts from that earlier month. Once you reach month 24, Medicare Part B coverage begins automatically on the first day of the following month. You will receive a Medicare card in the mail before that date.

Part B is not optional for most SSDI recipients. You are enrolled automatically, and you pay the standard premium unless you meet income thresholds for a subsidy. If you want to decline Part B, you must contact Social Security in writing and explain your reason — this is rare and usually only happens if you have employer coverage that is better than Medicare.

Key Takeaways

  • Medicare Part B begins automatically after 24 months on SSDI; you do not need to do anything to enroll.
  • Part B covers doctor visits, specialist care, outpatient hospital services, and medical equipment — the costs that come up between hospital stays.
  • You pay a monthly premium for Part B unless your income is below the threshold, which is around $97,000 per year for a single person in 2024.
  • If your income is very low, you may may have access to for Medicaid to cover your Part B premium and other costs Medicare does not pay.

What Part B actually covers

Medicare Part B pays 80 percent of the cost of most doctor visits and outpatient services after you meet your annual deductible. In 2024, that deductible is $240 per year. Once you have paid $240 out of pocket, Part B covers 80 percent of approved charges, and you pay the remaining 20 percent.

Part B covers preventive care with no deductible or copay — annual wellness visits, cancer screenings, blood pressure checks, and vaccines all have zero cost to you. It also covers mental health services, physical therapy, occupational therapy, and home health care ordered by your doctor. Durable medical equipment like canes, walkers, hospital beds, and oxygen equipment is covered, though you typically pay 20 percent of the approved amount.

Part B does not cover dental care, vision care, hearing aids, or long-term custodial care in a nursing home. It does not cover prescription drugs — that is Part D. If you need these services, you will need to pay out of pocket or rely on Medicaid if you may have access to.

The premium you pay and income limits

The standard Part B premium in 2024 is $164.90 per month, though this amount increases each year. If your income is below the threshold — $97,000 for a single person or $194,000 for a married couple filing jointly — you pay the standard premium and it is deducted directly from your SSDI check.

If your income is above these thresholds, you pay a higher premium called an Income-Related Monthly Adjustment Amount (IRMAA). The higher your income, the more you pay, up to a maximum of $560.50 per month in 2024. Income used to calculate IRMAA includes wages, self-employment income, interest, dividends, and some other sources, but not your SSDI benefits themselves.

If you have very low income and few resources, you may may have access to for Medicaid to pay your Part B premium for you. This is called the may have access to Medicare Beneficiary (QMB) program. To learn whether you may have access to, contact your state Medicaid office or call 1-800-MEDICARE.

How Part B works with other coverage you might have

If you are still working and have employer health insurance, Part B becomes your secondary insurance — your employer plan pays first, and Part B covers what it does not. You should keep your employer coverage if it is available to you, because it often covers things Medicare does not, like dental and vision.

If you have Medicaid in addition to Medicare, Medicaid acts as a secondary payer and covers costs Medicare leaves behind — copays, coinsurance, and deductibles. This combination is called dual coverage and is common for SSDI recipients with low income. Medicaid also covers services Medicare does not, like dental and long-term care.

If you enroll in a Medicare Advantage plan (Part C), you are using Part B benefits through a private insurance company instead of traditional Medicare. Advantage plans often have lower premiums but narrower networks of doctors. You can switch between traditional Medicare and Advantage plans during the annual enrollment period from October 15 to December 7.

What happens if you do not enroll or decline Part B

If you decline Part B when you first become covered, you can enroll later during the General Enrollment Period, which runs from January 1 to March 31 each year. However, you will pay a penalty — an extra 10 percent on your premium for each 12-month period you were not enrolled. This penalty is permanent and stays with you for life.

The only exception to the penalty is if you have employer coverage that is considered creditable — meaning it is as good as or better than Medicare. If you have employer coverage, you can decline Part B without penalty, but you must enroll in Part B within eight months of losing that coverage to avoid the penalty.

If you are unsure whether your employer coverage is creditable, ask your employer's benefits department or call 1-800-MEDICARE. It is worth getting this right, because the penalty can add hundreds of dollars per year to your premium.

How Part B coordinates with Part A and Part D

Medicare has four parts: Part A covers hospital stays and skilled nursing care; Part B covers doctor visits and outpatient care; Part D covers prescription drugs; and Part C (Advantage) is an alternative way to receive Parts A and B through a private plan. SSDI recipients automatically get Part A at the same time they get Part B — after 24 months on SSDI.

Part D is separate and optional. You must enroll in a Part D plan during the initial enrollment period or during the annual enrollment period in the fall. If you do not enroll when you first become covered, you pay a penalty for each month you delay — 1 percent of the national average premium per month. Unlike Part B, there is no exception for employer coverage unless it is considered creditable prescription drug coverage.

Many SSDI recipients with low income may have access to for Extra Help, a program that pays Part D premiums and reduces copays for prescriptions. You can explore for Extra Help through Social Security or Medicare. If you receive Medicaid, you may automatically may have access to.

Reporting changes that affect your Part B coverage

If your income changes significantly — either increasing above the IRMAA threshold or decreasing below it — you should report this to Social Security. Income changes affect your Part B premium, and reporting them ensures you pay the correct amount. You can report changes by calling Social Security at 1-800-772-1213 or visiting your local Social Security office.

If you move to a different state, your Medicare coverage continues, but your Medicaid coverage may change. Some states have more generous Medicaid programs than others, so moving could affect whether you may have access to for help paying your Part B premium. Contact your new state's Medicaid office to learn what you may be covered for.

If you lose employer coverage, you have 60 days to enroll in Part D without penalty. You should also contact Medicare to update your records, because losing employer coverage may make you newly may be able to access for Extra Help or other subsidies.

Frequently Asked Questions

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

You pay the standard premium ($164.90 per month in 2024) unless your income is very low. If your income is below $97,000 per year as a single person, you pay the standard amount. If your income is above that, you pay more. If you have Medicaid, it may pay your premium for you.

What if I decline Part B when I first become covered?

You can enroll later during the General Enrollment Period (January 1 to March 31), but you will pay a 10 percent penalty on your premium for each year you were not enrolled. The penalty is permanent. The only way to avoid it is if you had employer coverage that was as good as Medicare.

Does Part B cover prescription drugs?

No. Part B covers doctor visits and outpatient care. Prescription drugs are covered by Part D, which is a separate plan you must enroll in. If you do not enroll in Part D when you first become covered, you pay a penalty for each month you delay.

Can I use Part B with Medicaid?

Yes. If you have both Medicare and Medicaid, Medicaid pays costs that Medicare does not cover — copays, deductibles, and services like dental care. This combination is called dual coverage and is common for SSDI recipients with low income.

What if my income goes up after I enroll in Part B?

If your income rises above the IRMAA threshold, your Part B premium increases. You should report income changes to Social Security so your premium is adjusted correctly. You can appeal an IRMAA information if you believe your current income is lower than what Social Security used to calculate it.