Medicare Part B: What It Covers, What It Costs

Medicare Part B is outpatient coverage that helps pay for doctor visits and other medical services and supplies.
Jan 4, 2022
What Is Medicare Part B?

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Medicare Part B is the portion of Medicare best known for covering doctor visits and other outpatient medical services. In 2022, most people pay a monthly premium of $170.10. This premium is adjusted each year and can vary depending on your income.

Medicare Part B eligibility

You become eligible for Medicare Part B at age 65 and should sign up during the Initial Enrollment Period, the seven-month period around your birthday. Hitting the deadline is important. If you delay, you may face an expensive penalty.

What Medicare Part B covers and doesn’t cover

It’s important to remember that Medicare, including Part B, won’t take care of all of your health care costs. There are premiums, deductibles and copays. And some elements of health care, including long-term care, may not be covered at all by Medicare. "Even people who have made the best plans for retirement don’t always consider health care costs — including costs associated with Medicare — in their retirement budget," says Phil Moeller, author of "Get What’s Yours for Medicare: Maximize Your Coverage, Minimize Your Costs."

What Part B covers

Original Medicare is made up of two parts: Part A and Part B.

While Part A generally covers hospital stays and some skilled nursing facilities, Part B generally covers the following:


What it means

Medically necessary services

Medically necessary services include doctor visits, lab tests and X-rays. These services are subject to the Part B deductible and 20% copay.

Preventive care

Medicare Part B covers 100% of wellness exams and many types of preventive screenings, as well as flu shots. Check for a full list of covered preventive care.

Durable medical equipment

If your doctor determines you need certain equipment such as a walker, cane or wheelchair, Medicare will cover the cost minus your deductible or 20% copay.

Some prescription drugs

Prescription drugs that are administered in a doctor’s office or clinical setting, such as chemotherapy medicines. This is true regardless of whether or not you have purchased Medicare Part D prescription drug coverage.

Mental health services

Several outpatient and some limited inpatient mental health services are covered by Medicare Part B. Check for a full list of covered mental services and your costs.

Ambulance services

Ground ambulance transport if you need to be taken to a hospital, critical access hospital or skilled nursing facility, and transportation by another method isn't appropriate.

What Part B doesn’t cover:

Medicare Part B costs

Part B premiums

Premiums can vary depending on your income.

In 2022, the majority of people pay Medicare Part B monthly premiums of $170.10. (Premium amounts are adjusted each year.)

High-income beneficiaries may pay more than that. Beneficiaries filing individual tax returns whose income exceeds $91,000 will pay what’s known as an income-related monthly adjustment amount, or IRMAA, in addition to the standard monthly Part B premium. Total premium payments for people whose income exceeds the thresholds range from $238.10 to $578.30, depending on income. For a full list of adjusted premium costs, visit

Part B deductibles and copays

Medicare Part B comes with an annual deductible. In 2022, it is $233.

After you meet the deductible for the year, you typically pay 20% of the Medicare-approved amount for doctor services and other Medicare benefits. This assumes your doctor or other provider accepts Medicare assignment. In other words, your provider will accept the amount Medicare agrees to pay for the treatment or service. Some providers who charge more than the Medicare-assigned amount may bill patients for the difference. Always check with a new physician or other health care provider that they accept the amount Medicare pays.

Many Original Medicare enrollees purchase Medicare Supplement Insurance, also called Medigap, to help pay the out-of-pocket costs associated with Medicare Part B.

The Medicare Part B penalty

It’s extremely important to sign up for Medicare Part B on time. If you decide not to sign up for Part B at age 65 when you become eligible and later change your mind, you’ll pay an extra 10% above the standard premium cost for every 12-month period you delayed. What’s more, you’ll pay extra for the entire time you are covered by Medicare. That extra premium can add up to a significant amount over the course of your retirement.

If you choose Medicare Advantage

Many people who sign up for Medicare choose a Medicare Advantage plan, also known as Medicare Part C.

Medicare-approved private insurers administer Medicare Advantage plans. These policies must provide all of the same coverage in Original Medicare Part A and Part B. Often these policies include Medicare Part D prescription drug coverage and extra benefits not covered by Original Medicare, such as dental, vision, wellness and some home-care benefits.

In order to offer these extra benefits and keep costs down, Medicare Advantage plans often negotiate with a network of providers that plan members must use. This is different from Original Medicare in which beneficiaries may receive treatment from any Medicare provider.

If you choose Medicare Advantage, it’s important to compare total costs — including premiums, cost sharing and out-of-network charges — among plans and versus Original Medicare. Be aware that cost sharing and benefits of the plan you choose can change from year to year, so you need to evaluate coverage during every Medicare open enrollment period. offers a tool to help compare Medicare Advantage Plans.

Keep in mind: If you choose Medicare Advantage, then decide to move back to Original Medicare with Medicare Supplement Insurance, you may pay more than you expected. That’s because in all but four states, if you don’t sign up for a Medigap policy within six months of the time your Original Part B Medicare insurance begins, insurers may deny you coverage based on preexisting conditions, such as asthma, heart disease, diabetes or a pending surgery.

Find information on the different parts of Medicare:

Medicare Advantage (Medicare Part C)

If you have additional questions about Medicare, visit or call 800-MEDICARE (800-633-4227, TTY: 877-486-2048).

Frequently asked questions
How does Medicare Part B work with employer insurance?

You won’t pay the Medicare Part B penalty if you are covered by employer-sponsored insurance (yours or your spouse’s) from a company with 20 or more employees. In those cases, unless you are already receiving Social Security or Railroad Retirement Board benefits, you don’t have to do anything when you turn 65. (If you are receiving Social Security or those benefits, and you want to delay Medicare Part B, follow the instructions on the Medicare card you will receive near your 65th birthday.)

If you decide to stick with employer-sponsored coverage, it’s always wise to confirm with your employer benefits manager that your coverage will continue past age 65.

IMPORTANT: You do need to take action when your employer-sponsored insurance ends. You have eight months to sign up for Part B before incurring the penalty.

When should you enroll in Medicare Part B?

If you’re already receiving Social Security or Railroad Retirement Board benefits, you’ll automatically start receiving Original Medicare, Part A and Part B, the month you turn 65.

Everyone else must choose among these enrollment period options:

  • Initial Enrollment Period: This is the seven-month period starting three months before the month you turn 65, including your birthday month and ending three months after your birthday month. So if you turn 65 in July, you’ll have from April 1 to Oct. 31 to enroll.

  • Special Enrollment Period: This is for people who are still receiving health insurance benefits from a large employer or a spouse’s large employer when they turn 65. You have an eight-month period starting from the month after your employment ends or the month after losing your qualifying employer insurance, whichever happens first, to sign up for Medicare Part B without paying the late penalty.

  • General Enrollment Period: This runs from Jan. 1 through March 31 every year. This is the time when people who are already receiving Medicare benefits can make limited changes to their coverage. This is also when people who miss the deadline for initial enrollment can sign up.

Note: You still need to sign up for Medicare Part B if you are receiving health care continuation coverage under COBRA. Otherwise, you will pay the Part B penalty. COBRA beneficiaries aren't eligible for the special enrollment period. In other words, COBRA isn't the same as if you were covered under a large employer health plan.

That said, if you want to, you may be able to keep COBRA coverage to cover services that Medicare doesn't, such as dental insurance. You’ll need to contact your COBRA group insurance plan for more information and to help calculate the costs involved. Also, your spouse and dependents may be able to keep their COBRA coverage when you enroll in Medicare.

Can I keep my doctor on Medicare?

If you have health care coverage through Medicare Part B (medical insurance), you can see any health care provider who accepts Medicare and who is accepting new Medicare patients. You’ll want to ask your doctor if they can take you as a new Medicare patient.

That said, not all providers accept Medicare as full payment. Medicare classifies health care providers three ways:

  • Participating: They accept Medicare and Medicare’s approved payment for services.

  • Nonparticipating: They accept Medicare but may charge more than Medicare’s approved payment for services.

  • Opt-out: They don’t accept Medicare at all, and patients are responsible for all costs for care.

If you sign up for a Medicare Advantage Plan (Medicare Part C), you’ll need a plan that includes your doctor in its network. You might also find a Medicare Advantage plan that allows you to see out-of-network health care providers, but if your provider is out-of-network, it will typically cost more out-of-pocket to see them.

Does Medicare cover dental and vision services?

Original Medicare does not cover most dental care, dental procedures or supplies like cleanings, fillings, tooth extractions, dentures, dental plates, or other dental devices, although Medicare Part A (hospital insurance) will pay for specific dental services you receive when you’re in a hospital. Medicare also doesn’t cover eye exams for eyeglasses or contact lenses.

Some Medicare Advantage Plans (Medicare Part C) offer additional benefits such as vision, dental and hearing coverage. To find plans with coverage in your area, visit Medicare’s Plan Finder.

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