
Medicare Part B is a form of medical insurance that covers medically necessary doctor services, including outpatient services, preventive services, and some inpatient hospital doctor services. It is intended to fill in the gaps in medical insurance coverage left under Part A. Part B covers 80% of the reasonable charge for covered services, while the beneficiary is responsible for the remaining 20%. Individuals receiving Social Security retirement benefits, Social Security disability benefits for 24 months, and individuals entitled to Medicare Part A are automatically enrolled in Part B unless they decline coverage.
| Characteristics | Values |
|---|---|
| Type of Insurance | Medical Insurance |
| Services Covered | Medically necessary services, Preventive services, Doctors' services, Home health care, Durable medical equipment, Outpatient physical therapy, X-ray and diagnostic tests |
| Cost to Patient | 20% of the Medicare-Approved Amount for most services after meeting the Part B deductible; $0 for most preventive services if the healthcare provider accepts assignment |
| Insulin Coverage | $35 or less for a month's supply of insulin with an insulin pump covered under Part B's durable medical equipment benefit |
| Supplemental Insurance | Medigap can be purchased to help pay for out-of-pocket costs, including the 20% coinsurance for Part B |
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What You'll Learn

Medicare Part B covers medically necessary services and supplies
Medicare Part B is an optional medical insurance plan that helps cover medically necessary services and supplies, as well as preventive services. It is one part of Original Medicare, which also includes Medicare Part A (Hospital Insurance).
Medically necessary services are those that meet accepted standards of medical practice to diagnose or treat a medical condition. This includes doctors' services, outpatient care, and other medical services that Part A doesn't cover. For example, if you need to see a doctor for a diagnosis or treatment, Part B will help cover the cost.
Preventive services covered by Medicare Part B include healthcare to prevent illness (e.g. flu shots) or to detect it in its early stages when treatment is likely to be most effective. Most preventive services are free if provided by a healthcare provider who accepts assignment. Examples include exams, lab tests, and screening shots to help prevent, find, or manage a medical problem.
Medicare Part B also covers durable medical equipment, such as insulin pumps. If you use an insulin pump that is covered under Part B, your cost for a month's supply of insulin cannot be more than $35. Additionally, if you have Medicare Supplement Insurance (Medigap) that pays your Part B coinsurance, your Medigap plan should cover the cost of insulin (up to $35).
It is important to note that if you are in a Medicare Advantage Plan or other Medicare plan, the coverage rules may differ. However, your plan must provide at least the same level of coverage as Original Medicare.
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Preventative services are covered by Medicare Part B
Medicare Part B covers preventive services, which are forms of healthcare aimed at preventing illness or detecting it at an early stage when treatment is likely to be most effective. These services include health monitoring, counselling, and education to help individuals take care of their health. For instance, Medicare Part B may cover services to prevent the flu.
Most preventive services are free of charge if you receive them from a healthcare provider who accepts assignment. However, if you are in a Medicare Advantage Plan or other Medicare plan, your plan may have different rules. Nevertheless, your plan must give you at least the same coverage as Original Medicare.
Medicare Part B is one part of Original Medicare, which also includes Medicare Part A (Hospital Insurance). Original Medicare covers inpatient hospital care, doctors' services and tests, and preventive services. To be eligible for Medicare Part B coverage, you must be lawfully present in the United States.
You can log in to your secure Medicare account to check your preventive services and their coverage.
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Medicare Part B and Medicare Supplement Insurance (Medigap)
Medicare Part B is Medical Insurance that covers two types of services: medically necessary services and preventive services. Medically necessary services are services or supplies that meet accepted standards of medical practice to diagnose or treat a medical condition. Preventive services are healthcare services that prevent illness or detect it at an early stage when treatment is likely to be most effective.
Medicare Supplement Insurance, also known as Medigap, is extra insurance that can be purchased from a private insurance company to help pay for out-of-pocket costs in Original Medicare (Part A and Part B). Medigap policies are standardized, meaning that policies with the same letter offer the same basic benefits, regardless of the insurance company or location. There are ten different types of Medigap plans offered in most states, named by letters from A-D, F, G, and K-N. The price is the only difference between plans with the same letter sold by different insurance companies.
It's important to note that you can only buy Medigap if you have Original Medicare. This typically means enrolling in both Medicare Part A (Hospital Insurance) and Part B (Medical Insurance) before purchasing a Medigap policy. Once you have Medicare Part B and are 65 or older, you have a six-month Medigap Open Enrollment period to enroll in any Medigap policy without being denied coverage due to pre-existing health conditions. After this initial enrollment period, purchasing a Medigap policy may be more difficult or expensive.
Medigap plans can help fill coverage gaps in Original Medicare, including deductibles, copays, and coinsurance. For example, if you have Part B and a Medigap plan that covers your Part B coinsurance, your Medigap plan should cover the cost of insulin (up to $35 or less). Additionally, some Medigap plans cover foreign travel emergency services.
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Medicare Part B covers inpatient hospital doctor services
Medicare Part B is medical insurance that covers medically necessary services, supplies, and preventive services. Part B generally covers 80% of the Medicare-approved amount for doctors' services received during inpatient hospital care. This includes inpatient hospital care in critical access hospitals and skilled nursing facilities.
Medically necessary services are those that meet accepted standards of medical practice to diagnose or treat a medical condition. Preventive services include healthcare to prevent illness or detect it in its early stages when treatment is likely to be most effective.
Medicare Part B also covers insulin for those who use an insulin pump or obtain their insulin through a Medicare Advantage Plan. The monthly cost for a month's supply of insulin for a Part B-covered insulin pump cannot be more than $35.
It is important to note that Medicare Part B is separate from Medicare Part A, which is hospital insurance that helps pay for inpatient hospital care, skilled nursing facility care, hospice care, and some home health care. While Part A covers inpatient hospital care, Part B specifically covers doctors' services received during inpatient hospital stays.
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Medicare Part B covers outpatient physical therapy
Medicare Part B is medical insurance that covers medically necessary services and preventive services. Original Medicare, which includes Medicare Part A (Hospital Insurance) and Medicare Part B (Medical Insurance), covers outpatient therapy services provided by physical therapists, occupational therapists, speech-language pathologists, doctors, and other healthcare professionals.
Medicare Part B covers a set amount of outpatient physical therapy without an annual cap. Original Medicare covers 80% of the Medicare-approved amount for outpatient therapy, while you pay a 20% coinsurance after meeting your Part B deductible. For example, in 2025, you would pay a 20% coinsurance after meeting the $257 deductible. If your total therapy costs reach a certain amount, your provider must confirm that your therapy is medically necessary for Medicare to continue covering it.
Medicare's coverage rules for outpatient therapy may not apply in certain situations, such as when therapy is part of a Medicare-covered stay in a skilled nursing facility or when you are receiving Medicare-covered home health care. In such cases, you need to understand how the costs and coverage rules apply by contacting your Medicare provider.
It is important to note that if you have Original Medicare and see a participating provider, they cannot charge you more than the Medicare-approved amount. A participating provider is a healthcare provider who accepts Medicare and always takes assignment.
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Frequently asked questions
Medicare Part B is Medical Insurance that covers medically necessary doctor services and most preventive services. It is intended to fill some of the gaps in medical insurance coverage left under Part A.
Medicare Part B covers inpatient hospital doctor services, outpatient services, home health care, durable medical equipment, outpatient physical therapy, x-ray and diagnostic tests.
After the beneficiary meets the annual deductible, Medicare Part B covers 80% of the "reasonable charge" for covered services, with the beneficiary responsible for the remaining 20%.





























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