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What Medicare Is and How It Works

Medicare is a federal health insurance program run by the Centers for Medicare & Medicaid Services (CMS). It primarily covers people age 65 and older, but also covers some younger people with disabilities and those with end-stage renal disease. As of 2024, more than 68 million Americans have Medicare coverage.

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The program is divided into different parts, each covering different services. Part A covers hospital stays, skilled nursing facility care, hospice care, and some home health services. Part B covers doctor visits, outpatient services, medical equipment, and preventive care. Part D covers prescription drugs. Part C, also called Medicare Advantage, is an alternative way to receive Medicare benefits through private insurance companies approved by Medicare.

Understanding how Medicare works is important because the program has specific rules about when you can enroll, what services are covered, and what you pay out of pocket. Many people have questions about deductibles, copayments, and coinsurance amounts. A deductible is the amount you pay before Medicare starts paying its share. A copayment is a fixed amount you pay for a specific service. Coinsurance is a percentage of the cost you pay after you meet your deductible.

Medicare is funded through payroll taxes, premiums paid by beneficiaries, and general federal revenues. Most people who worked and paid Medicare taxes for at least 10 years while employed do not pay a premium for Part A coverage. However, they typically do pay premiums for Part B, Part D, or Part C depending on their coverage choices.

Practical Takeaway: A free information guide about Medicare can explain these basic program structures, coverage types, and cost-sharing details so you understand what Medicare is before making decisions about your coverage.

When You Can Enroll and Initial Enrollment Periods

Medicare has specific time windows when you can enroll in coverage. Missing these windows can result in permanent late enrollment penalties unless you have a qualifying circumstance. Understanding these enrollment periods is critical because they determine when your coverage can start.

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The Initial Enrollment Period (IEP) is a seven-month window centered around your 65th birthday. It begins three months before the month you turn 65 and ends three months after. For example, if you turn 65 in June, your IEP runs from March through September. During this period, you can enroll in Part A and Part B without penalties, regardless of whether you are still working or have employer health coverage.

The General Enrollment Period (GEP) runs from January 1 to March 31 each year. You can enroll in Part A and Part B during this time if you missed your IEP. However, if you enroll during the GEP, your coverage typically starts July 1 of that year, and you may face a late enrollment penalty that increases your Part B premium for as long as you have Medicare.

For Part D prescription drug coverage, the Initial Coverage Election Period is the same seven-month window as for Part A and B. The Annual Enrollment Period (AEP) for prescription drug coverage runs from October 15 to December 7 each year. During this period, you can change your Part D plan or enroll if you did not have coverage. If you go without creditable prescription drug coverage for 63 days or more, you will typically pay a late enrollment penalty.

There are Special Enrollment Periods (SEPs) that allow you to enroll outside the regular windows if you experience certain qualifying life events, such as losing employer coverage, moving to a new state, or having a change in income.

Practical Takeaway: An informational guide should clearly explain enrollment periods and deadlines so you understand when you can enroll and what happens if you miss key dates.

Medicare Coverage Options and Plan Types

Medicare offers different ways to receive your benefits, and understanding each option helps you make informed decisions about which coverage might work for your situation. The traditional approach uses Original Medicare, which consists of Part A and Part B. With Original Medicare, you can see any doctor or hospital that accepts Medicare throughout the United States. You pay deductibles, copayments, and coinsurance for covered services.

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Medicare Advantage (Part C) is an alternative to Original Medicare offered by private insurance companies. These plans must cover everything that Original Medicare covers, but they often include additional benefits like dental, vision, or hearing coverage. Many Medicare Advantage plans have $0 premiums, though you still pay the Part B premium to Medicare. However, Medicare Advantage plans typically use networks, meaning you may have to see specific doctors and hospitals to pay lower costs. These plans also usually have maximum out-of-pocket limits, which cap your yearly costs.

Prescription drug coverage (Part D) is available through standalone plans if you have Original Medicare, or it may be included in a Medicare Advantage plan. Part D plans are offered by private insurance companies and vary in which drugs they cover and what your costs are. Each plan has a formulary, which is a list of covered medications.

Medigap policies are supplemental insurance sold by private companies that work with Original Medicare. They help pay some costs that Original Medicare does not cover, such as copayments, coinsurance, and deductibles. There are different Medigap plans, each with different benefits and costs. Medigap is different from Medicare Advantage because it works alongside Original Medicare rather than replacing it.

For people with lower incomes and limited resources, programs like the Medicare Savings Program and the Low-Income Subsidy can help pay premiums and out-of-pocket costs.

Practical Takeaway: A guide describing Medicare plan types should explain the differences between Original Medicare, Medicare Advantage, Part D, and Medigap so you understand what each option covers and how costs work with each type.

What Services and Preventive Care Medicare Covers

Medicare Part A covers inpatient hospital services, meaning stays in a hospital as an admitted patient. It covers room and board, medications given in the hospital, medical equipment used during your stay, and lab tests and X-rays. Part A also covers skilled nursing facility care when you need medically necessary care after a hospital stay of at least three days. Hospice care is covered when you choose comfort care instead of treatment for a terminal illness.

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Medicare Part B covers doctor visits in offices, clinics, and hospitals. It covers diagnostic tests like blood work and imaging, physical therapy, occupational therapy, and home health services in certain situations. Part B also covers durable medical equipment such as wheelchairs, walkers, oxygen equipment, and diabetic supplies. Mental health services, including therapy and counseling, are covered under Part B.

Medicare covers a range of preventive services at no cost to you. These include annual wellness visits where a doctor reviews your health history and creates a prevention plan. Screening tests for cancer, diabetes, heart disease, and other conditions are covered. Vaccinations against flu, pneumonia, shingles, and RSV are covered under Part B. Bone density screening for osteoporosis is covered. Colorectal cancer screening through colonoscopy, sigmoidoscopy, or other methods is covered. Breast cancer screening through mammography is covered. Depression screening and counseling are covered preventive services.

It is important to note that Medicare does not cover all services. Routine dental care, routine eye exams, eyeglasses, hearing aids, and routine foot care are generally not covered by Original Medicare. However, some Medicare Advantage plans include these benefits. Long-term care in a nursing home is not covered by Medicare, though Medicare may pay for short-term skilled nursing care following a hospital stay.

Practical Takeaway: An informational guide should list what Medicare covers and what it does not so you know what services are available and where you might need supplemental coverage or out-of-pocket payment.

Costs, Deductibles, and Out-of-Pocket Expenses

Understanding Medicare costs is essential for planning your healthcare budget. Medicare costs vary depending on which parts of Medicare you use and which plan you choose. For 2024, the Part B standard deductible is $240 per year. This means you pay the first $240 of your Part B services before Medicare starts paying its share. After you meet the deductible, you typically pay 20% of the cost for most Part B services, and Medicare pays 80%.

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Part A has different cost-sharing rules. When you are admitted