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What Part B Covers and Why It Matters for Your Healthcare

Medicare Part B is the portion of Original Medicare that covers doctor visits, outpatient care, and certain medical equipment—but many people don't fully understand what that actually means for their day-to-day healthcare. Part B typically covers preventive services like annual wellness visits, certain cancer screenings, and vaccines. It also covers medically necessary office visits with doctors and specialists, urgent care center visits, and outpatient hospital services like same-day surgery or diagnostic testing.

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The scope of Part B is broader than many realize. For example, if you need an X-ray, ultrasound, or lab work ordered by your doctor, Part B generally covers 80 percent of those costs after you meet your annual deductible (which was $240 in 2024). If your doctor prescribes durable medical equipment—items like walkers, oxygen supplies, or diabetic testing strips—Part B may cover a portion of that cost too. Mental health services, including therapy and psychiatry visits, are covered under Part B when provided by a Medicare-enrolled provider. Physical therapy and occupational therapy are also included when ordered as part of medical treatment.

What Part B does not cover is equally important to understand. Routine dental work, eye exams for glasses or contacts, hearing aids, and long-term custodial care in nursing homes fall outside Part B's scope. Prescription medications taken at home are not covered by Part B; that's where Part D (prescription drug coverage) comes in. This distinction helps explain why many people layer additional coverage on top of Original Medicare.

Practical takeaway: Before reviewing coverage options, write down the healthcare services you currently use most—your regular doctor visits, any specialists, medications, and preventive care. This list will help you understand which Part B details matter most to your specific situation.

Understanding the Costs You'll Pay Under Part B

Part B has a monthly premium that most beneficiaries pay through Social Security (or directly to Medicare if you don't receive Social Security). The standard Part B premium in 2024 was $164.90 per month, though the actual amount varies based on your income—higher earners may pay more through Income Related Monthly Adjustment Amounts (IRMAA). Beyond the monthly premium, Part B requires you to pay an annual deductible before Medicare's cost-sharing kicks in. For 2024, that deductible was $240.

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Once your deductible is met, coinsurance becomes your responsibility. Medicare covers 80 percent of most Part B services, and you pay 20 percent. This means if you see a specialist and the visit costs $200, you'd pay $40 out of pocket. For some preventive services—like annual wellness visits, certain screenings, and vaccinations—there is no coinsurance; you pay nothing if the provider is in-network and accepts Medicare assignment.

The costs can add up quickly with ongoing medical needs. A person with diabetes seeing their endocrinologist monthly, plus quarterly lab work, plus an ophthalmologist visit for diabetic retinopathy screening, could face several hundred dollars in annual coinsurance costs under Part B alone. Someone recovering from surgery and attending physical therapy twice weekly might accumulate significant out-of-pocket costs within a few months. These are real scenarios that make the difference between Original Medicare, Medigap supplemental plans, and Medicare Advantage plans matter significantly to your wallet.

It's also worth noting that Part B's costs are adjusted each year. The premiums, deductibles, and coinsurance percentages may change, so what you pay this year might differ next year. The program sends notices before January 1st explaining any changes, but many people miss these notices or don't fully read them.

Practical takeaway: Calculate your estimated annual Part B costs by adding the monthly premiums you'd pay for 12 months, plus the deductible, plus estimated coinsurance based on your typical doctor visits and services. This number helps you understand what "pure" Original Medicare costs and whether additional coverage might save you money.

Original Medicare Part B Versus Medicare Advantage Plans

When you turn 65 and become eligible for Medicare, you face a fundamental choice: stay with Original Medicare (Parts A and B), or switch to a Medicare Advantage plan (also called Part C). This decision shapes your entire Medicare experience, and it's one of the most consequential healthcare decisions many people make. Understanding the differences helps you see which approach fits your situation.

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Original Medicare Part B is a fee-for-service model: you go to any doctor or hospital that accepts Medicare, you pay your share of the cost, and Medicare pays theirs. There are no network restrictions (except for certain specialty services). You can see any cardiologist in the country, switch doctors whenever you want, and generally have freedom in your healthcare choices. However, you're responsible for 20 percent coinsurance on most services, potentially unlimited, depending on how much care you need.

Medicare Advantage plans, by contrast, operate more like traditional health insurance with networks, copays, and out-of-pocket maximums. Instead of paying 20 percent coinsurance indefinitely, you pay a fixed copay per visit (typically $20-$50) and hit an out-of-pocket maximum, after which the plan covers everything. However, you must use in-network doctors, and many plans require referrals to see specialists. Medicare Advantage plans often include prescription drug coverage (Part D) built in, whereas with Original Medicare, you must enroll in a separate Part D plan.

The trade-off comes down to flexibility versus financial predictability. Original Medicare gives you freedom but uncertain costs. Medicare Advantage gives you cost caps but restricted choices. According to the Kaiser Family Foundation, approximately 42 percent of Medicare beneficiaries were enrolled in Medicare Advantage plans as of 2023, showing that neither option dominates. Many people choose based on their health status: those with chronic conditions who see many specialists often prefer Original Medicare's freedom, while healthier beneficiaries prefer Medicare Advantage's lower out-of-pocket caps.

Practical takeaway: List your current doctors and hospitals. Check whether they accept Medicare and whether they're in-network with Medicare Advantage plans in your area. If most of your care is with one health system that partners with a Medicare Advantage plan, you may gain benefits from that plan. If your doctors are spread across multiple networks or you travel frequently, Original Medicare's freedom may matter more.

Supplemental Coverage (Medigap) Options for Part B

Many people choose to layer additional coverage on top of Original Medicare Part B specifically to reduce their out-of-pocket costs. These supplemental policies, called Medigap plans, are standardized by the federal government and offered by private insurance companies. Medigap is a completely different product from Medicare Advantage; you can have Original Medicare plus Medigap, but you cannot have Medicare Advantage and Medigap at the same time.

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Medigap plans are labeled with letters—Plan A, Plan B, Plan C, Plan D, Plan G, Plan N, and several others. Each letter represents a different combination of benefits. For example, Plan G covers your Part B coinsurance (the 20 percent you'd normally pay), your Part B deductible, and various other costs. Plan N is less expensive but requires you to pay small copays at doctor visits. The trade-off is straightforward: higher-premium plans cover more of your costs, lower-premium plans make you pay more out-of-pocket.

The cost of Medigap varies dramatically based on which plan you choose, your age, your location, and the insurance company. According to Medicare data, Plan G premiums ranged from roughly $120 to $300 per month in 2024 depending on the carrier and state. If you add that to your Part B premium, plus your actual medical costs, the total cost picture becomes much clearer. For someone with frequent medical needs, a Medigap plan might actually save money compared to paying 20 percent coinsurance on every service.

Enrollment timing matters for Medigap. You have a six-month "open enrollment period" starting the month you turn 65 and enroll in Part B. During this window, insurance companies must cover you regardless of pre-existing conditions and cannot charge you more based on health status. If you miss this window and apply later, companies can deny your application or charge higher premiums based on health conditions. This is one of the few hard enrollment deadlines in Medicare that genuinely affects your options.

Practical take