Yes, you can have Part B without Part A, but it depends on when you first became may be able to access

You can enroll in Medicare Part B (medical insurance) without Part A (hospital insurance) if you were not automatically enrolled in Part A when you turned 65 or became may be able to access through disability. The key is timing: if you delayed Part A on purpose and enrolled in Part B instead, that is allowed. If you turned 65 and did nothing, Medicare enrolled you in both automatically, and you would have had to actively decline Part A to have only Part B now.

The reason this matters is cost. Part B has a monthly premium that increases if you delay enrollment past your initial window. Part A is free for most people (because they or a spouse paid Medicare taxes while working), so having only Part B means you pay Part B premiums with no hospital coverage — a significant gap if you need inpatient care.

Key Takeaways

  • You can have Part B alone if you enrolled in it during your initial may be able to access window and did not take Part A, or if you actively declined Part A.
  • Part A is free for most people over 65, so choosing Part B alone means paying Part B premiums while leaving hospital stays uncovered.
  • If you delayed both Part A and Part B past your initial window, you will pay a permanent penalty on Part B premiums for each year you waited.
  • If you have group health insurance through an employer, you may be able to delay both parts without penalty, but the rules are strict and require written documentation.
  • Part B without Part A leaves you responsible for all hospital costs, including the Part A deductible, which was over $1,600 in 2024.

When Part B alone makes sense

Part B without Part A is practical only in narrow situations. If you have group health insurance through a current employer (yours or your spouse's), you can delay both Part A and Part B without penalty. Your employer plan covers hospital care, so Part A is redundant. When you eventually leave that job or lose the coverage, you have eight months to enroll in Part A without penalty.

Another scenario: you are a non-citizen or do not have the work history to may have access to for free Part A. In that case, you can enroll in Part B alone and pay the Part B premium. You would not have hospital coverage unless you buy Part A separately (which costs a monthly premium if you do not may have access to for free Part A).

A third situation is if you actively declined Part A when you turned 65 or became may be able to access, perhaps because you had other coverage. You can keep that choice and hold only Part B, though you remain uninsured for hospital stays.

The cost of having Part B without Part A

Part B covers doctor visits, outpatient care, and some equipment and services. It does not cover hospital stays. If you are hospitalized without Part A, you pay the full bill yourself — in 2024, that started with a deductible over $1,600 per benefit period, plus coinsurance for each day in the hospital.

Part B premiums vary by income. In 2024, the standard premium was $164.90 per month for most people, but higher earners pay more. If you delayed enrolling in Part B past your initial window, you pay a permanent 10 percent penalty on top of the standard premium for each full year you waited. That penalty stays with you for life.

Part A, by contrast, is free if you or your spouse paid Medicare taxes for at least 10 years. Even if you do not may have access to for free Part A, the premium is usually lower than Part B. The math almost always favors having both.

How to enroll in Part B without Part A

If you have group health insurance and want to delay both parts, contact your employer's benefits office and ask them to document in writing that you are covered under their plan. Keep that letter. When you lose the coverage, you have eight months to enroll in both Part A and Part B without penalty.

If you are declining Part A for another reason, contact Social Security (1-800-772-1213) or visit your local Social Security office. Tell them you want Part B only. They will confirm your choice and enroll you in Part B during your initial window (the three months before and after the month you turn 65, or become may be able to access through disability).

If you missed your initial window, you can still enroll in Part B during the General Enrollment Period (January 1 through March 31 each year), but you will owe the late penalty. There is no way around it once you have missed the window.

What happens if you change your mind later

If you have Part B alone and later decide you need Part A, you can enroll during the General Enrollment Period or if you lose other coverage. However, if you delayed Part A past your initial window, you will owe a permanent 25 percent penalty on the Part A premium for twice the number of years you were without it. That penalty also stays for life.

For example, if you delayed Part A for three years, you pay a 75 percent penalty (25 percent × 3 years) on the Part A premium forever. This is why most people should enroll in Part A when first may be able to access, even if they do not use it when ready.

Part B without Part A and Medigap or Medicare Advantage

If you have Part B alone, you can still buy a Medigap policy (supplemental insurance) or enroll in a Medicare Advantage plan (Part C). However, Medigap policies are designed to work alongside Part A and Part B together. Without Part A, a Medigap policy covers less than it would otherwise, because there is no hospital coverage to supplement.

Medicare Advantage plans also assume you have Part A. If you have only Part B, the plan may not cover hospital stays the way it is designed to. Before buying either type of plan, tell the insurance company that you have Part B without Part A and ask whether the plan will work for you.

Frequently Asked Questions

What if I turned 65 and did nothing — do I automatically have both parts?

Yes. If you did not actively decline Part A, Medicare enrolled you in both Part A and Part B automatically. You would have had to contact Social Security and refuse Part A in writing to have only Part B. If you are unsure whether you have Part A, call Social Security at 1-800-772-1213 or check your Medicare card.

Can I drop Part A and keep only Part B to save money?

You can drop Part A, but you will lose hospital coverage and still pay Part B premiums. Since Part A is free for most people, dropping it does not save money — it just leaves you uninsured for hospital stays. If you have Part A and want to drop it, contact Social Security, but understand the consequences first.

What if I have Part B but no Part A and I get hospitalized?

You will owe the full hospital bill yourself. Part B does not cover inpatient hospital care. The bill can easily reach tens of thousands of dollars. This is why having Part A is important, even if you rarely use it.

Does employer coverage count as a reason to skip Part A?

Yes, if the coverage is through a current employer (yours or your spouse's). You can delay both Part A and Part B without penalty. When you lose that coverage, you have eight months to enroll in both parts without penalty. Make sure your employer documents your coverage in writing.

Will I pay a penalty if I enroll in Part B without Part A during my initial window?

No. If you enroll in Part B during your initial may be able to access window (three months before and after the month you turn 65), there is no penalty, even if you decline Part A. The penalty applies only if you delay Part B enrollment past that window.