Understanding Medicare’s different parts can feel confusing at first, but once you break them down the structure becomes clearer. Each part plays a different role in how your coverage works and what you pay out of pocket.
Part A covers hospital stays, skilled nursing facilities, hospice, and certain home health services. This is often called inpatient coverage and is generally focused on care when you’re formally admitted to a facility rather than routine or long‑term custodial care.
Part B covers outpatient medical care, including doctor visits, preventive services, diagnostic testing, durable medical equipment, and many outpatient therapies. You typically pay a monthly premium for Part B and may also pay deductibles and coinsurance when you use services.
Part C, also called Medicare Advantage, is offered by private insurers and combines Parts A and B into a single plan, often including Part D prescription coverage as well. Many Advantage plans include additional benefits like dental, vision, hearing, and wellness extras, but they also use provider networks and plan rules that can affect which doctors you can see and what you pay.
Part D focuses specifically on prescription drug coverage through stand‑alone drug plans or built‑in benefits in many Medicare Advantage plans. These plans use formularies (lists of covered drugs), tiers, and preferred pharmacies, so your actual costs depend on the medications you take and the plan you select.
Together, Parts A, B, C, and D give you a menu of options to build your Medicare coverage. The key difference between them lies in what types of care they cover, how you access services, and how costs are shared between you and the plan, which is why comparing them side by side is so important when you first enroll or when you review your coverage each year.
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