Javascript is not enabled.

Javascript must be enabled to use this site. Please enable Javascript in your browser and try again.

Understanding Medicare Part A, Part B, Part C and Part D -- AARP Health Skip to content

Is your 'stuff' stressing you out? TV personality Matt Paxton has tips for downsizing and decluttering in our free, two-part webinar! Register now.


The Medicare Plans (Yes, Plans)

What you need to know about Parts A, B, C and D

For the most recent information on Medicare Parts A,B,C and D, see our guide Medicare Made Easy.

When making your Medicare selections, you have what sometimes seems like a dizzying array of choices.

Different types of Medicare plans help pay for your inpatient hospital care, doctor visits, outpatient services, home health care, prescription drugs, some care in a skilled nursing facility and much more, depending on the plan or plans you choose.

But as complicated as all that sounds, there’s a single key choice at the core of all your decision-making: Will you go with the Original Medicare plan, which is run by the federal government and consists of Parts A and B, or a Medicare Advantage plan (also called Part C) that is offered by a private insurer and approved by Medicare?

Medicare Part A — Your Hospital Coverage
When you apply to Medicare, you are automatically enrolled in the Part A plan. Part A is your hospital insurance plan. It covers nursing care and hospital stays, although not doctors’ fees. Part A also covers some home health services, skilled nursing care after a hospital stay and hospice care.

You likely won’t have to pay a monthly premium for Medicare Part A, thanks in part to all the payroll taxes you paid while you were employed. You must, however, pay a yearly deductible before Medicare will cover any hospitalization costs. 

Part A pays about 80 percent of your Medicare-approved, inpatient costs for the first 60 days you are hospitalized. If you have a longer hospital stay, you will have to pay a larger share of the costs. (That’s where it helps to have supplemental insurance.)

If you are a U.S. citizen or permanent resident and have not worked long enough to qualify for Medicare, and can't qualify through a spouse, you may be able to buy Part A coverage.

As a fee-for-service health plan, Original Medicare enables you to see any doctor or hospital that accepts Medicare.

Medicare will pay a share  of the "Medicare-approved amount," which is the cost Medicare determines is "reasonable" for the care you received, given where you live.

If you live in a city, it’s worth remembering that doctors in urban areas tend to charge more for their services, and since the "Medicare-approved amount" isn't always raised accordingly, you could end up with higher than expected expenses.

To better predict your out-of-pocket costs, be sure to ask both Medicare and your doctor’s billing department about fees and coverage.

Medicare Part B — Your Medical Coverage
Part B pays for a portion of your doctor visits, some home health care, medical equipment, outpatient procedures, rehabilitation therapy, laboratory tests, X-rays, mental health services, ambulance services and blood.

Part B is optional, and you may want to opt out of Part B if you still have health insurance through an employer, union, your spouse, etc. Part B requires that you pay a monthly premium to Medicare (the standard rate for 2011 is $115.40), and there is a small deductible ($162 in 2011) that must be reached before Part B begins paying for services. People with higher incomes above $85,000 annually for an individual or $170,000 for a couple pay higher rates.

A warning about delayed enrollment: If you opt out of Part B when you initially enroll in Medicare but later decide that you want the coverage, you may have to pay a higher premium.

It's important to weigh carefully the health care resources you’ll have — not just in the next year or so, but also several years down the road. Individuals who will have strong retiree benefits from, say, a union or public service career may choose to opt out of Part B, while those who are still working but don’t expect to receive retiree health benefits often opt to switch over to Part B before leaving the work force.

Medicare Part C — Your Private Insurance Option
Part C plans are offered through private insurance companies and approved by Medicare. They are also known as Medicare Advantage or Medicare Health plans.

Before enrolling in a Part C plan, you must first enroll in Original Medicare — both Part A and Part B. If you decide to use Medicare Advantage, you choose the plan yourself and sign up directly with the private insurer.

By law, Part C plans must pay for at least the same health care services as Original Medicare. But they sometimes pay for things that are not covered by Original Medicare, such as vision and dental care. Most, but not all, Medicare Advantage plans also provide some prescription drug coverage.

Medicare Advantage plans are generally organized as health maintenance organizations (HMOs) or preferred provider organizations (PPOs). Typically, in these types of plans you choose one doctor as your primary care provider, and your choice of doctors, hospitals and other health care providers is restricted. If you see providers outside of the plan’s network, you likely will pay more, or these providers’ care might not be covered at all.

Private fee-for-service Medicare Advantage plans, which allow for the regular use of out-of-network providers, are available in some areas.

You can check with Medicare for availability near you. For more detailed information, see the Medicare publication Your Guide to Medicare Private Fee-for-Service Plans.

Medicare Part D — Your Prescription Drug Plan
The newest addition to the Medicare alphabet, Part D, helps you pay for prescription drugs.

Part D is optional and available to people who are enrolled in Original Medicare (Parts A and B) and most Medicare Advantage plans.

Part D plans are offered by private insurance companies that are approved by Medicare. You sign up for them directly with the private insurer.

If you are enrolled in a Part D plan, you will pay a monthly premium and sometimes a deductible, as well as copayments for your drugs.

Each plan varies in the cost of premiums, the price of drugs and its list of covered drugs or "formulary" under the plan.

A disadvantage of Part D is the coverage gap — known as the "doughnut hole" — that's reached when the combined cost of your prescriptions in a given year, as paid by both you and your insurer, exceeds a certain amount ($2,840 in 2011). At that point, you essentially start paying for your medicines as if you have no insurance. At the same time, you’re also paying your Part D premiums.

To ease the pain of falling into the doughnut hole, the new health care law provides that, starting in 2011, people with Medicare Part D will receive a 50 percent discount on most brand-name prescriptions and biologic drugs, and a 7 percent discount on generic prescription drugs while they are in the coverage gap.

After your prescription drug costs reach a certain amount over the course of the year (in 2011 that threshold is $4,550), you will qualify for low-cost catastrophic coverage. This takes you through to the end of the year, at which point the calculus starts all over again. The Part D "doughnut hole" coverage gap will gradually narrow until it disappears in 2020.

To get a sense of how the coverage gap might affect you, use the AARP Doughnut Hole Calculator. For more information, see "Paying Less for Drugs in the Doughnut Hole."

Join the Discussion

0 | Add Yours

Please leave your comment below.

You must be logged in to leave a comment.