Medicare Plans Explained: Parts, Coverage, and How to Choose

Medicare is not a single plan. It is a set of parts and private plan options that fit together in different ways, and the combination you choose determines what you pay and which doctors you can see. This guide explains the pieces in plain language so you can compare options on the things that actually differ.

The Parts of Medicare

Part A covers hospital care and Part B covers doctor visits and outpatient care; together they are often called Original Medicare. Part D is prescription drug coverage, sold by private insurers. Medicare Advantage (Part C) bundles Parts A and B — and usually drugs — into a single private plan, often with extras like dental or vision. Medigap (supplement) plans work alongside Original Medicare to help with its out-of-pocket costs.

What It Typically Costs

What you pay depends on the route you choose: monthly premiums, deductibles, copays at the point of care, and — importantly — whether the plan has a yearly limit on out-of-pocket spending. Original Medicare has no built-in out-of-pocket maximum, which is one reason many people add a supplement or choose Advantage instead. Comparing plans on premium alone can be misleading; your expected total cost depends on how much care you actually use.

Things to Consider

• Whether your current doctors and hospital are in the plan's network.
• Whether your prescriptions are covered, and at what cost tier.
• How the plan handles care when you travel.
• Your enrollment timing — missing a window can mean penalties or limited options later.
• Which extras matter to you, such as dental, vision, hearing, or fitness benefits.

Questions Worth Asking

• Are my doctors and pharmacy in this plan's network?
• What is my estimated total yearly cost if I use care at my usual level?
• Does the plan have a yearly out-of-pocket maximum?
• What are the rules for seeing specialists or getting prior authorization?

The Bottom Line

There is no single best Medicare setup — the right fit depends on your doctors, your prescriptions, and how you prefer to pay. Compare total expected costs and provider access, not just the monthly premium.