Learn what each part of Medicare covers—and more importantly, what it doesn't cover
By David Haertzen, Founder of SocialSecurityMedicare.com
Hello, friends. If you’re approaching 65, you’ve probably been flooded with mail, seen countless TV commercials, and heard so much about Medicare that your head is spinning. All this talk of Part A, Part B, Part C, Part D... it can feel like you’re trying to decipher a secret code. It's what I call "the alphabet soup of retirement."
I get it. When my wife and I were preparing to enroll, I drew on my decades of experience in the insurance industry to cut through the noise, and it was still a lot to take in. My goal today is to serve as your translator. We're going to take this confusing alphabet soup and turn it into a simple, digestible meal. Understanding these four basic building blocks is the first and most important step to making a confident decision about your healthcare for years to come.
Please Note: The information on this website is for educational purposes only and does not constitute medical or financial advice. My goal is to empower you with knowledge, but you should always perform your own research and consult with appropriate professionals. For official information, please visit the Official Medicare Website. Government agencies have neither reviewed nor endorsed this information.
The Foundation: Original Medicare (Parts A & B)
First things first: when people talk about the traditional, government-run health insurance program, they are talking about Original Medicare. This is the foundation of your coverage and it's made up of two parts: A and B.
Medicare Part A: Your Hospital Insurance
Think of Part A as your "Hospital Insurance." It’s primarily designed to cover the big, intensive medical events. If you are admitted to a hospital or need specific types of inpatient care, Part A is what steps in to help pay the bills.
What Part A Primarily Covers:
- Inpatient Hospital Stays: This includes a semi-private room, meals, nursing services, and drugs administered as part of your inpatient treatment.
- Skilled Nursing Facility (SNF) Care: This is NOT long-term custodial care (like a nursing home). It is short-term care you receive in a SNF after a qualifying hospital stay to recover from an illness or injury.
- Hospice Care: For terminal illness, Part A covers care focused on comfort and quality of life.
- Home Health Care: In certain situations, it covers part-time skilled nursing care or therapy in your home if you are homebound.
For most of us who worked and paid Medicare taxes for at least 10 years, there is no monthly premium for Part A. However, it's not completely free—you will have a deductible to pay for each hospital benefit period.
Medicare Part B: Your Medical Insurance
If Part A is for the hospital, think of Part B as your "Doctor and Outpatient Insurance." This is the part of Medicare you will likely use most often. It covers a vast range of services and supplies that are medically necessary to treat your health condition.
What Part B Primarily Covers:
- Doctor's Visits: Seeing your primary care physician or a specialist.
- Outpatient Care: Services you receive in a hospital or clinic when you are not formally admitted, like in an emergency room or for outpatient surgery.
- Preventive Services: This is a key benefit! It includes your annual wellness visit, flu shots, and screenings for things like cancer and diabetes.
- Durable Medical Equipment (DME): Things like walkers, wheelchairs, and oxygen.
- Ambulance Services and a wide range of other medical services.
Unlike Part A, everyone pays a monthly premium for Part B, which is often deducted directly from your Social Security check. You will also have an annual deductible. After you've met your deductible, you typically pay 20% of the Medicare-approved amount for most services. This 20% coinsurance has no annual limit, which is a key reason why many people get additional insurance.
Visualizing Your Medicare Options
This chart breaks down the four main parts of Medicare and their primary purpose.
Filling the Gaps: Parts C & D
So, Original Medicare (A + B) provides a solid foundation. But it has some significant gaps, most notably the lack of coverage for prescription drugs and the potentially unlimited 20% coinsurance. This is where the next two parts come in, and they represent a choice—a fork in the road.
Medicare Part D: Your Prescription Drug Coverage
Part D is straightforward: it helps cover the cost of your prescription medications. These plans are sold by private insurance companies that are approved by Medicare. If you stick with Original Medicare, you will almost certainly want to buy a standalone Part D plan.
Each plan has its own list of covered drugs, called a "formulary." It is absolutely critical to choose a plan that covers the specific medications you take to keep your out-of-pocket costs low.
Medicare Part C: The "All-in-One" Alternative (Medicare Advantage)
This is where the confusion often peaks. Part C, also known as Medicare Advantage, is not an add-on to Original Medicare. It is a complete replacement for it. These are plans offered by private companies that bundle Parts A, B, and usually D all into one package.
Here’s how it works: you are still in the Medicare program, but instead of the government paying your claims, it pays a private insurance company a fixed amount each month to manage your care. In exchange, the company provides all your Part A and Part B services. Most Advantage plans also include drug coverage and extra benefits not covered by Original Medicare, such as routine dental, vision, and hearing.
The trade-off? These plans typically have provider networks (like an HMO or PPO), meaning you must use their doctors and hospitals to get the lowest costs. They often have low (even $0) monthly premiums but you will pay copayments or coinsurance for services as you use them, up to a yearly maximum out-of-pocket limit.
Your First Step to Clarity
The "alphabet soup" isn't so intimidating once you break it down:
- Part A & B (Original Medicare): The government-run foundation for hospital and medical coverage.
- Part D: Adds prescription drug coverage to Original Medicare.
- Part C (Medicare Advantage): An all-in-one, private insurance alternative to Original Medicare.
Understanding these four parts is the essential first step. It empowers you to ask the right questions and begin to think about the next big decision: which path is right for you? Will you stick with Original Medicare and supplement it, or will you choose a Medicare Advantage plan? We'll tackle that exact question in our next major article.