Medicare can feel like alphabet soup at first. Once you understand what each part actually covers, it gets a lot less confusing. Here’s a plain-language breakdown.
Part A covers care you receive as an inpatient — hospital stays, skilled nursing facility care after a hospital stay, hospice care, and some home health care.
Most people don’t pay a monthly premium for Part A. If you or your spouse paid Medicare taxes while working for at least 10 years (40 quarters), Part A is premium-free. You’ll still have deductibles and coinsurance costs when you actually use it.
What Part A does not cover: long-term custodial care (like an ongoing nursing home stay for daily living help), most dental care, eye exams for glasses, or hearing aids.
Part B covers outpatient care — doctor visits, preventive services (like annual wellness visits and many screenings), durable medical equipment, ambulance services, and outpatient mental health care.
Unlike Part A, almost everyone pays a monthly premium for Part B. The amount is set annually and can be higher for people with higher reported income (this is called IRMAA — Income-Related Monthly Adjustment Amount). There’s also an annual deductible before Medicare starts sharing costs, and after that, you’re typically responsible for 20% of the Medicare-approved amount for most services, with no annual out-of-pocket cap under Original Medicare alone.
That last point is important: Original Medicare (Parts A and B) has no yearly limit on what you could pay out of pocket. This is exactly why most people pair it with either a Medigap policy or a Medicare Advantage plan.
Part C, better known as Medicare Advantage, is an alternative way to get your Medicare benefits. Instead of Original Medicare paying claims directly, you enroll in a plan offered by a private insurance company that’s approved by Medicare.
Medicare Advantage plans are required to cover everything Original Medicare covers, and most bundle in extra benefits Original Medicare doesn’t offer — things like dental, vision, hearing, and sometimes prescription drug coverage (Part D) all in one plan. Many have a $0 monthly premium beyond what you already pay for Part B.
The trade-off is usually a more structured network of doctors and hospitals, and you may need referrals for specialists depending on the plan type (HMO vs. PPO). Every plan has an annual out-of-pocket maximum, which is a real advantage over Original Medicare alone.
Part D covers prescription medications. It’s offered through private insurance companies, either as a standalone plan (if you have Original Medicare) or bundled into a Medicare Advantage plan.
Each Part D plan has its own list of covered drugs, called a formulary, organized into cost tiers. This is exactly why the specific plan you choose matters — two people with the same health conditions could pay very different amounts depending on which plan covers their specific medications and at what tier.
One thing worth remembering: if you’re eligible for Medicare and don’t enroll in a Part D plan (or other creditable drug coverage) when you’re first eligible, you can face a permanent late enrollment penalty added to your premium if you sign up later.
Most people end up choosing one of two paths:
Neither path is universally “better” — the right one depends on your health needs, which doctors you want to keep seeing, your budget, and how much predictability you want in your costs.
This article is educational and general in nature. Costs, premiums, and program rules mentioned above are subject to change from year to year — always confirm current figures at Medicare.gov or 1-800-MEDICARE. We do not offer every plan available in your area; contact us and we’ll walk through which options are actually available where you live.
Have questions about your specific situation? Schedule a free, no-pressure consultation and we’ll help you sort out which path makes sense for you.
