Medicare is built from four pieces, each labeled with a letter. You don't get all four automatically — and they don't all do what people assume they do. Here's what each one actually is, in the order they make sense.
The Four Parts, Explained
A
Hospital Insurance
When you're admitted
Part A covers care you receive when you're checked in — inpatient hospital stays, skilled nursing after a hospital stay, hospice, and some home health. Most people pay no monthly premium for Part A because they (or a spouse) paid into it through payroll taxes for 10+ years.
Inpatient hospital stays (room, meals, nursing)
Skilled nursing facility after a qualifying hospital stay
Hospice care
Limited home health services
Premium-free for most. If you worked and paid Medicare taxes for at least 40 quarters, Part A costs you $0 in premium. There's still a deductible per hospital stay.
B
Medical Insurance
When you're not admitted
Part B covers care you receive without being admitted — doctor visits, lab work, outpatient surgeries, preventive screenings, durable medical equipment, and ambulance rides. Everyone pays a monthly premium for Part B (most pay the standard amount; higher earners pay more).
Doctor and specialist visits
Outpatient procedures and surgeries
Lab work, imaging, preventive screenings
Durable medical equipment (walkers, oxygen, etc.)
A + B together = "Original Medicare." This is the federal program itself. It covers a lot — but not everything, and not at 100%.
C
Medicare Advantage
A different way to get A and B
Part C — usually called Medicare Advantage — is not extra Medicare. It's a private plan that replaces Original Medicare for you and delivers your A and B benefits through a carrier's network instead. Many also bundle in Part D drug coverage and extras like dental, vision, or fitness.
Covers everything A and B cover (by law)
Often includes prescription drug coverage
May include dental, vision, hearing, fitness
Uses a network — out-of-network care costs more or isn't covered
Common mix-up: Having Part C does not mean you also have separate A and B coverage running alongside it. The plan takes the place of using Original Medicare directly.
D
Prescription Drug Coverage
For medications from a pharmacy
Part D covers prescriptions you fill at a pharmacy. It's sold as a standalone plan by private carriers, or bundled inside most Medicare Advantage plans. Every plan publishes a list (called a "formulary") of which drugs it covers and at what tier.
Most prescription medications
Each plan has its own formulary and pharmacy network
Drugs administered in a doctor's office are usually Part B, not D
Skipping Part D when first eligible can trigger a lifetime penalty
Tied to your specific prescriptions. The "best" Part D plan depends entirely on which drugs you actually take — same drugs can cost very different amounts on different plans.
Questions on this? Text me at (941) 312-1278 — no pressure. Just here if you want to talk.
How the parts fit together
Most people end up on one of two paths. You don't combine these — you choose between them.
Path 1 — Original Medicare: Part A + Part B + (optional) Part D + (optional) Medigap supplement
— OR —
Path 2 — Medicare Advantage: Part A + Part B + Part C (which usually includes Part D)
Either way, you start with A and B. The fork is whether you stay with Original Medicare and add pieces around it — or move into a Medicare Advantage plan that takes over delivery of your A and B benefits.
Quick reference — what each part is not
Part A is not free for everyone. If you didn't work long enough under Medicare-covered employment, there can be a Part A premium.
Part B is not optional in practice. You can delay it if you have qualifying employer coverage — but skipping it without that triggers a permanent late penalty.
Part C is not "more Medicare." It's how you receive your A and B coverage — through a private carrier instead of directly from the federal program.
Part D is not part of Original Medicare. Original Medicare (A + B) has almost no outpatient drug coverage. Part D fills that gap.
Medigap is not Part C. Medigap (also called Medicare Supplement) is a different kind of plan that pays the gaps Original Medicare leaves — only works alongside Original Medicare, not with Advantage.
Want help mapping these to your actual situation?
The parts make sense on paper. Choosing between Original Medicare and Advantage — and figuring out drug coverage — depends on your doctors, prescriptions, and budget. That's the conversation worth having.
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Kelly Hood
Independent Representative
AmeriLife of Polk County, LLC · Sebring, FL
Serving Polk · Highlands · Hardee · Okeechobee
NPN 21391969
Serving Polk · Highlands · Hardee · Okeechobee
NPN 21391969