What Does Medicare Part B Cover In 2026? Costs & Benefits

Medicare Part B is the piece of Original Medicare that handles your outpatient and preventive care, but the details of what does Medicare Part B cover aren't always obvious. Between doctor visits, lab work, durable medical equipment, and mental health services, there's a lot to sort through. And in 2026, updated costs and coverage rules make it even more important to know exactly what you're paying for.

This article breaks down the specific services and benefits Part B includes, what it costs this year, and where the gaps are. You'll walk away with a clear picture of how Part B works and whether your current coverage actually fits your needs, or if there are better options available.

At Golden Health and Life Agency, we help seniors and Medicare-eligible individuals compare plans across more than 300 insurance carriers. If you're trying to figure out your Part B coverage or considering a Medicare supplement, our team can walk you through it, no jargon, no pressure.

Why Medicare Part B matters in 2026

If you're on Medicare or getting close to eligibility, Part B is the coverage you'll rely on most for everyday medical needs. It handles the outpatient side of Original Medicare, meaning every time you see a doctor, get a lab test, or need a medical device, Part B is what kicks in. Understanding exactly what does Medicare Part B cover in 2026 helps you avoid unexpected bills and make smarter decisions about supplemental coverage.

New cost thresholds in 2026

The standard Part B premium in 2026 is $185.00 per month, which is a notable increase from prior years. If your income exceeds certain thresholds, you'll also pay an Income Related Monthly Adjustment Amount, known as an IRMAA surcharge, on top of that base premium. Higher earners can pay significantly more, so knowing where your income falls matters before you finalize your plan selection.

The 2026 annual Part B deductible is $257, which you pay out of pocket before Medicare starts covering 80% of approved services.

Your costs don't stop at the premium and deductible. After you meet the deductible, you typically pay 20% of the Medicare-approved amount for most covered services, with no out-of-pocket maximum under Original Medicare alone. That 20% can add up fast if you face a serious diagnosis or need ongoing specialist care.

Why gaps in coverage are a real concern

Part B covers a lot, but it doesn't cover everything. Dental, vision, and hearing care are largely excluded, and there's no cap on what you can spend in a year without a supplement. Many beneficiaries don't realize those gaps exist until they're already facing a bill. Pairing Part B with a Medigap plan or Medicare Advantage can close those gaps and protect your finances.

Knowing these gaps before you need care gives you time to plan. Reviewing your coverage options annually, especially during the Medicare Open Enrollment period each fall, keeps your protection current and your out-of-pocket costs predictable.

What Medicare Part B covers

Part B covers two main categories: medically necessary services and preventive care. Medically necessary services are treatments your doctor determines you need to diagnose or treat a medical condition. Preventive care includes screenings and vaccines designed to catch problems early or stop them from developing altogether.

Outpatient and preventive services

When you look at what does Medicare Part B cover at the service level, the list is broad. Part B pays for doctor visits, outpatient surgery, lab tests, X-rays, mental health services, and physical therapy. It also covers durable medical equipment like wheelchairs, walkers, and blood sugar monitors when a doctor prescribes them.

On the preventive side, Part B covers services such as:

• Annual wellness visits

• Cardiovascular and diabetes screenings

• Cancer screenings (mammograms, colonoscopies)

• Flu, pneumococcal, and COVID-19 vaccines

Part B covers 100% of the Medicare-approved amount for most preventive services when you see a participating provider, meaning no out-of-pocket cost to you.

Ambulance transportation and certain home health care also fall under Part B coverage. So do limited outpatient prescription drugs administered in a clinical setting, such as chemotherapy infusions and certain injections given directly in your doctor's office.

What Part B does not cover

Understanding what does Medicare Part B cover also means knowing where its coverage ends. Routine dental care, eyeglasses, hearing aids, and long-term custodial care are services many seniors rely on, but they fall entirely outside of Original Medicare's scope. That's a significant gap when you consider how common those needs become with age.

If you see a non-participating provider, you may owe more than the standard 20% coinsurance, since those providers can charge above the Medicare-approved amount.

The biggest gaps to know about

The exclusions that catch people off guard most often include prescription drugs you take at home, cosmetic procedures, and most care received outside the United States. Part B only covers drugs administered directly in a clinical setting, not your daily medications. For those, you need a separate Part D drug plan to avoid paying full price out of pocket.

Overseas travel is another blind spot. If you need medical care while abroad, Part B will not pay for it in most situations. A Medigap policy can add limited foreign travel emergency coverage, which is worth considering if you travel internationally with any regularity.

How Medicare Part B costs work in 2026

Part B costs come in layers, and knowing each one helps you budget accurately. Your $185.00 monthly premium is the baseline, but it is not the full picture. Once you meet the $257 annual deductible, Medicare covers 80% of approved services and leaves you responsible for the remaining 20% with no annual cap on what you can spend.

What you pay at the point of care

After your deductible, every covered service under Part B comes with a 20% coinsurance charge. If your doctor bills $500 for an outpatient procedure, you owe $100 at that visit. Those amounts add up fast with specialist visits, imaging tests, or ongoing physical therapy over the course of the year.

Without a Medigap supplement, there is no ceiling on how much that 20% coinsurance can total in a single year.

Income-based premium adjustments

Understanding what does Medicare Part B cover in terms of cost also means knowing about IRMAA. If your income exceeds certain thresholds, the IRMAA surcharge increases your monthly premium beyond the standard $185.00. For 2026, individuals earning above $106,000 pay more, and reviewing your income bracket early gives you time to prepare or file an appeal if your earnings dropped significantly from the reference year.

How to use Part B and avoid surprises

The best way to control your costs under Part B is to stay proactive before you ever need care. Confirming that your doctor accepts Medicare assignment before each visit keeps you from paying more than the standard 20% coinsurance. Providers who accept assignment agree to Medicare's approved rates, while non-participating providers can charge above them.

Check your provider's status before every visit

Medicare's provider search tool at medicare.gov lets you find participating providers in your area before you book. Before scheduling any appointment, confirm that the provider accepts Medicare assignment, not just Medicare in general. That one distinction directly affects what you owe at the end of the visit.

A provider who accepts Medicare but not assignment can charge up to 15% above the Medicare-approved amount, which comes directly out of your pocket.

Review your coverage each year

Understanding what does Medicare Part B cover in the current year is only part of the equation. Your health needs change, and your coverage should keep pace with them. Each fall during the Medicare Open Enrollment period, from October 15 through December 7, you can switch plans, add a supplement, or update your Part D drug coverage.

Pairing Part B with a Medigap policy is one of the most practical ways to cap your annual out-of-pocket spending and avoid large unexpected bills.

Final takeaways

What does Medicare Part B cover comes down to two core categories: medically necessary services and preventive care. Part B pays for doctor visits, outpatient procedures, lab work, durable medical equipment, and preventive screenings, but it leaves out dental, vision, hearing, and home prescriptions. In 2026, the standard premium is $185.00 per month, the deductible is $257, and you pay 20% coinsurance on most covered services with no annual spending cap.

Those gaps are real, and they can lead to large bills if you go into the year without a plan. Pairing Part B with a Medigap supplement or Medicare Advantage closes the most expensive holes in your coverage. Reviewing your options each fall during Open Enrollment keeps your protection aligned with your actual health needs.

If you want help comparing your options across more than 300 carriers, talk to a Medicare specialist at Golden Health and Life Agency today.