Medicare A, B, C, and D — what the letters actually mean

Medicare is split into parts, and the lettering is genuinely confusing. Here is the short version.

Part A covers inpatient hospital care, skilled nursing after a hospital stay, and hospice. Most people have paid for it through payroll taxes over their working life and pay no monthly premium for it.

Part B covers doctor visits, outpatient care, lab work, and durable medical equipment like walkers and oxygen. It has a monthly premium, and that premium is higher for people with higher incomes.

Part C is not separate coverage. It is Medicare Advantage: a private plan that bundles A and B, usually adds drug coverage, and often adds dental or vision. You are still in Medicare, but a private insurer manages it and sets the network.

Part D is prescription drug coverage, sold separately by private insurers.

The real decision is a fork in the road. You either stay with Original Medicare (A and B) and typically add a Medigap supplement plus a Part D drug plan, or you choose a Medicare Advantage plan that packages it together.

Neither is simply better. Original Medicare plus Medigap generally lets you see any provider who accepts Medicare and makes your costs predictable, but the supplement has its own premium. Medicare Advantage usually costs less monthly and may include extras, but you are working inside a network and you need referrals more often.

Two questions decide it for most people. First: are your doctors, and any specialists you rely on, in the plan network? Second: are the specific prescriptions you take on the plan formulary, and at what tier?

Bring your actual list of doctors and your actual list of medications to any conversation about this. An agent who does not ask for both of those lists is not doing the work.

Questions about your own situation? A Guild agent licensed in your state can walk through it with you at no cost. Talk to an agent