Medicare Medical (Part B) covers doctor visits and outpatient care, while Medicare Hospital (Part A) covers inpatient stays

When people say "Medicare medical," they usually mean Medicare Part B, which pays for doctor office visits, lab tests, X-rays, and outpatient procedures. Part B is separate from Part A, which covers hospital stays. You pay a monthly premium for Part B—the amount depends on your income—and it does not start automatically when you turn 65. You have to sign up for it during your enrollment window, or you may face a permanent penalty on your premium.

The confusion happens because Medicare itself is the whole program, but it has four distinct parts. Part A and Part B together are called Original Medicare. Part C (Medicare Advantage) and Part D (prescription drug coverage) are add-ons or alternatives. If someone asks whether you have "Medicare medical," they are asking whether you have Part B coverage, not whether you have Medicare at all.

Key Takeaways

  • Medicare Part B is the medical insurance piece of Original Medicare and covers doctor visits, lab work, imaging, and outpatient procedures.
  • Part B requires a separate monthly premium and does not enroll automatically—you must sign up during your Initial Enrollment Period or a General Enrollment Period.
  • If you delay Part B enrollment without a may have access to reason, Medicare adds a permanent 10 percent penalty to your premium for each year you were late.
  • Part B works alongside Part A (hospital coverage), and together they form Original Medicare, which is different from Medicare Advantage (Part C).
  • Your Part B premium amount is based on your income from two years prior, so higher earners pay more than the standard rate.

What Medicare Part B Actually Covers

Part B pays for services you receive from a doctor or other healthcare provider outside a hospital. This includes office visits for checkups, treatment of chronic conditions, mental health counseling, physical therapy, and diagnostic tests like blood work and ultrasounds. It also covers outpatient surgery—procedures done at a hospital or surgery center where you go home the same day.

Part B does not cover routine dental, vision, or hearing care. It does not pay for long-term care at home or in a nursing facility. Prescription drugs are covered under Part D, which is a separate enrollment. If you have Original Medicare (Part A and Part B), you can add Part D at any time, and you should do so when you first become may be able to access to avoid a penalty.

How Part B Premiums Work and Who Pays Them

In 2024, the standard Part B premium is $164.90 per month for most people, but the amount you pay depends on your modified adjusted gross income (MAGI) from two years before. If your income was higher, you pay a higher premium—sometimes significantly higher. Medicare sends you a notice each year showing your premium amount and the income figure they used to calculate it.

You pay the premium through automatic deduction from your Social Security check, or by sending a check to Medicare if you do not receive Social Security. If you believe Medicare used the wrong income figure, you can request a review and provide recent tax documents or other proof of a life-changing event—retirement, divorce, or death of a spouse—that lowered your income.

When You Must Enroll in Part B

Your Initial Enrollment Period is the seven-month window that starts three months before the month you turn 65 and ends three months after. If you enroll during this window, your coverage starts on the first day of your birth month or the month after, depending on when you sign up. This is the easiest time to enroll because there is no penalty.

If you miss your Initial Enrollment Period, you can enroll during the General Enrollment Period, which runs January 1 through March 31 each year. Coverage begins July 1 of that year. However, Medicare adds a 10 percent penalty to your Part B premium for each full year you were may be able to access but did not enroll. This penalty stays on your premium for as long as you have Part B, so delaying enrollment is costly.

You may avoid the penalty if you had creditable coverage—employer health insurance or TRICARE—during the time you were not enrolled in Part B. You must show proof of that coverage when you enroll.

Part B Costs Beyond the Premium

The monthly premium is only one cost. When you use Part B services, you also pay a deductible (the amount you must pay out of pocket before Part B starts paying) and coinsurance (your share of the cost after the deductible is met). In 2024, the Part B deductible is $240 per year. After you meet it, you typically pay 20 percent of the cost of covered services, and Medicare pays 80 percent.

These costs add up differently depending on how much healthcare you use. If you see many doctors or have frequent tests, you will reach the deductible quickly and then pay coinsurance on each visit. Some people buy a Medigap policy (supplemental insurance) to cover the deductible and coinsurance, which costs extra but can reduce surprise bills.

Original Medicare Part B Versus Medicare Advantage

If you enroll in Part B, you stay in Original Medicare unless you switch to Medicare Advantage (Part C). Original Medicare lets you see any doctor or hospital that accepts Medicare, and there are no network restrictions. You pay the premium, deductible, and coinsurance as described above.

Medicare Advantage is an alternative to Original Medicare offered by private insurance companies. It includes Part A and Part B coverage (and usually Part D) in one plan, often with lower premiums and deductibles. However, you must use doctors and hospitals in the plan's network, and you may need referrals to see specialists. Some people prefer Advantage for the lower upfront costs; others prefer Original Medicare for the freedom to choose providers.

You cannot have both Original Medicare Part B and Medicare Advantage at the same time. You must choose one or the other during your enrollment period.

How to Enroll in Part B

You can enroll in Part B through Medicare.gov, by calling 1-800-MEDICARE, or by visiting your local Social Security office. You will need your Social Security number and proof of citizenship or legal residency. If you are still working and have employer health insurance, tell Medicare—this may delay your enrollment start date, but it protects you from a penalty when you do enroll.

Once you enroll, Medicare sends you a Medicare card in the mail. Keep it with you when you see a doctor. Your doctor's office will use it to bill Medicare for your visit. If you do not receive your card within two weeks of your enrollment confirmation, contact Medicare to check the status.

Frequently Asked Questions

Do I have to enroll in Part B when I turn 65?

No, but you should enroll during your Initial Enrollment Period (the seven-month window around your 65th birthday) to avoid a permanent penalty. If you have employer health insurance through work, you may delay Part B without penalty, but you must enroll within eight months of losing that coverage.

What happens if I miss the enrollment important date?

You can enroll during the General Enrollment Period (January 1 through March 31), but Medicare adds a 10 percent penalty to your premium for each year you were late. This penalty stays on your premium permanently. You can avoid it only if you had creditable coverage during the time you were not enrolled.

Can I use Part B at any doctor?

Most doctors accept Medicare Part B, but not all. Before your visit, ask the doctor's office whether they accept Medicare and whether they are a "participating provider" (which means they accept Medicare's approved amount as full payment). Some doctors charge more than Medicare allows.

Does Part B cover prescription drugs?

No. Part B covers doctor visits and outpatient care. Prescription drugs are covered under Part D, which you enroll in separately. You should sign up for Part D when you first become may be able to access to avoid a penalty on your premium.

What is the difference between Part B and a Medigap policy?

Part B is your basic medical coverage from Medicare. A Medigap policy is supplemental insurance you buy from a private company to cover the deductible, coinsurance, and copayments that Part B does not pay. Medigap is optional but can reduce your out-of-pocket costs if you use healthcare frequently.