What Is Medicare Part B — and What It Really Covers

ByMichael Reynolds

When you first hear about Medicare Part B, it might sound like a bunch of letters and forms. But Part B is actually one of the most important parts of your Medicare coverage — it’s what helps you see doctors, get checkups, manage ongoing health conditions, and stay well.

If Part A is your “hospital coverage,” then Part B is your everyday health insurance. It’s what you use for routine care, outpatient services, and medical supplies. Let’s break it down — simply and clearly — so you know exactly what it does, what it costs, and how to use it.

Understanding the Basics

Medicare Part B is part of Original Medicare, the government’s health insurance program for people 65 and older, and for some younger people with disabilities or chronic conditions.

While Part A helps with hospital stays, Part B helps pay for:

  • Doctor visits and outpatient care

  • Preventive screenings (like mammograms or flu shots)

  • Lab tests and X-rays

  • Medical equipment (like wheelchairs or oxygen)

  • Ambulance services

You can think of Part B as the piece that keeps you healthy — helping you catch issues early, manage them effectively, and avoid hospital stays when possible.

Who Qualifies for Part B

If you’re eligible for Medicare, you’re also eligible for Part B. Enrollment works differently depending on your situation:

  • If you’re already getting Social Security or Railroad Retirement benefits, you’ll be automatically enrolled in both Parts A and B when you turn 65.

  • If not, you’ll need to sign up manually through the Social Security Administration — either online, by phone, or in person.

If you or your spouse are still working and have employer health coverage, you may choose to delay Part B until that coverage ends. When you leave your job or lose your employer insurance, you’ll have a Special Enrollment Period to sign up without penalty.

Tip: Even if you delay Part B, make sure you understand the deadlines. Waiting too long after your coverage ends can mean higher premiums later.

What Medicare Part B Covers

Part B covers a wide range of medical and preventive services. Here’s how it breaks down — in plain English.

Doctor Visits and Outpatient Care

Part B covers visits to your primary care doctor, specialists, and most outpatient procedures. This includes things like:

  • Office visits

  • Same-day surgery

  • Diagnostic imaging (like MRIs or CT scans)

  • Lab tests

  • Outpatient mental health therapy

As long as the service is medically necessary and performed by a provider who accepts Medicare, it’s covered. You typically pay 20% of the approved cost after meeting your annual deductible.

Example: Mary visits her cardiologist for a check-up. The visit costs $150 under Medicare’s approved amount. Mary pays $30 (20%), and Medicare covers the rest.

Preventive Care and Screenings

One of the best parts of Medicare Part B is that it helps you stay healthy — not just get treated when you’re sick.

Part B covers dozens of preventive services at no cost to you, including:

  • Annual “Wellness” visit

  • Flu and pneumonia shots

  • Screenings for diabetes, cancer, and heart disease

  • Depression screenings

  • Bone density tests for osteoporosis

You won’t pay anything for these services if you go to a provider that accepts Medicare assignment.

Preventive care might not feel urgent, but it’s what helps catch small issues early — before they become major health problems.

Ambulance Services

Part B covers emergency ambulance transportation when you need medical care and can’t safely travel another way. It also covers non-emergency transportation if it’s medically necessary (for example, to get dialysis or oxygen therapy).

Medicare typically pays 80% of the approved amount, and you pay the remaining 20% coinsurance.

Durable Medical Equipment (DME)

Part B covers medical equipment that’s ordered by your doctor for use at home — things like:

  • Wheelchairs and walkers

  • Blood sugar monitors

  • Oxygen supplies

  • CPAP machines

Medicare pays 80% of the cost; you pay 20%. Suppliers must be Medicare-approved for coverage to apply.

Mental Health & Therapy

Medicare Part B includes coverage for outpatient mental health services, such as:

  • Individual or group therapy sessions

  • Psychiatric evaluations

  • Medication management

Inpatient psychiatric care, however, falls under Part A. So if you’re seeing a therapist or psychiatrist outside a hospital, Part B is what covers it.

Medications Given in a Doctor’s Office

Some drugs — like chemotherapy, infusions, or injections administered in a clinic — are covered by Part B, not Part D. This includes medications that must be given by a healthcare professional rather than taken at home.

For regular prescriptions you fill at a pharmacy, you’ll need Part D (drug coverage) or a Medicare Advantage plan that includes it.

What Medicare Part B Doesn’t Cover

While Part B is broad, it doesn’t cover everything. You’ll pay out of pocket for:

  • Routine dental, vision, or hearing care

  • Most prescription drugs (covered by Part D instead)

  • Long-term care or assisted living

  • Cosmetic surgery

  • Over-the-counter medications

For these gaps, many people choose Medicare Supplement (Medigap) or Medicare Advantage (Part C) plans to expand coverage.

What Part B Costs

Unlike Part A, Part B always has a monthly premium. The standard premium in 2024 is $174.70, but it can be higher if your income is above a certain level (this is called IRMAA, the Income-Related Monthly Adjustment Amount).

You’ll also pay:

  • Annual deductible: $240 in 2024

  • Coinsurance: 20% of approved costs for most services

If you get Social Security, your Part B premium is usually deducted automatically from your monthly benefit.

Tip: Many people find it helpful to add a Medigap Plan G or N, which covers most of the 20% coinsurance — turning unpredictable medical bills into steady, manageable costs.

Signing Up for Part B

You can sign up for Part B in three ways:

  1. Automatically: if you’re getting Social Security or Railroad Retirement benefits before 65.

  2. Manually: by applying through the Social Security Administration.

  3. During Special Enrollment: if you delayed because you had employer coverage.

If you miss your Initial Enrollment Period and don’t qualify for a Special Enrollment Period, you may pay a late-enrollment penalty — a 10% increase in your premium for every 12-month period you could’ve had Part B but didn’t sign up.

To apply, visit ssa.gov/medicare or call 1-800-772-1213.

Real-Life Example: Using Part B in Everyday Life

Let’s say Linda, age 68, lives in Illinois and has both Parts A and B. She visits her doctor for a routine checkup, gets a flu shot, and has blood work done.

  • The checkup and flu shot are preventive — $0 cost.

  • The blood test falls under medically necessary lab work — Medicare pays 80%, Linda pays 20%.

A few months later, she injures her shoulder and goes to outpatient physical therapy. Part B covers the therapy sessions after her deductible — again, 80/20 split.

For Linda, Part B is the part of Medicare she uses the most.

How Part A and B Work Together

Think of it like this:

  • Part A = Hospital and inpatient care

  • Part B = Doctors, tests, and outpatient care

When you’re admitted to the hospital, Part A covers the facility. When your doctor visits you there, Part B covers their services.

Together, they form Original Medicare — and once you have both, you can decide whether to stay with it or move to Medicare Advantage (Part C) for bundled coverage.

Common Questions About Part B

“Do I have to take Part B?”

Not necessarily. If you have employer coverage, you can delay it. But once you retire, you’ll need to sign up or face higher premiums later.

“Does Part B cover routine checkups?”

Yes — your “Welcome to Medicare” visit and yearly wellness visits are fully covered if your doctor accepts Medicare.

“Can I use any doctor?”

Yes, as long as the provider accepts Medicare assignment. Over 90% of U.S. doctors do.

“Is there a limit to what I’ll pay per year?”

Original Medicare doesn’t have an out-of-pocket maximum. That’s why some people add Medigap or switch to Medicare Advantage, which caps total yearly costs.

Key Takeaways

  • Medicare Part B covers doctor visits, preventive care, outpatient services, and durable medical equipment.

  • You’ll pay a monthly premium and a small deductible, then 20% coinsurance.

  • It’s essential for staying healthy and catching issues early.

  • Most people use Part B regularly — it’s what makes Medicare feel like “real insurance.”

In Short

Medicare Part B is your link to everyday healthcare — from annual checkups to physical therapy to lab work. It’s not just coverage for when you’re sick; it’s peace of mind that lets you stay well and active.

Understanding what it does — and doesn’t — cover helps you plan better, budget smarter, and make Medicare work for you.

At GetMedicareSolutions, our mission is to keep that information simple, clear, and human — so you can focus on your health, not the fine print.

Similar Posts