What is Medicare? It is the federal health insurance program for people 65 and older, plus some younger people with disabilities, and its lettered parts can be confusing at first. This guide explains who qualifies, what Parts A, B, C, and D do, how Original Medicare differs from Medicare Advantage, what Medicare costs in 2026, and when to sign up so you avoid a lifelong late penalty.
1. Who Qualifies for Medicare
So what is Medicare, exactly? It's a federal health insurance program for U.S. citizens and permanent residents. It covers people who are 65 or older, certain younger people with disabilities, and people with end-stage renal disease, which is permanent kidney failure that requires dialysis or a transplant. If you're under 65 with a disability, you generally become eligible after receiving Social Security Disability benefits for 24 months. People with ALS, also called Lou Gehrig's disease, are eligible as well.
Eligibility isn't based on income, according to the Medicare Rights Center. You qualify at 65 whether your income is modest or high, although what you pay for some parts can change with your income, as you'll see below.
It also helps to know what Medicare is not. Medicare is not Medicaid. Medicaid is a separate program for people with lower incomes, and states and the federal government fund it jointly. Some people qualify for both programs.
Medicare also isn't one single plan. It's a set of parts and options, and you choose how to combine them. Once you understand the four parts, the rest of the system becomes much easier to follow, and the choices you face at 65 feel far less overwhelming.
2. The Four Parts of Medicare
Medicare has four parts, and Parts A and B together are called Original Medicare, while Parts C and D were added later to fill in gaps in that original coverage.
| Part | What it covers | Who provides it |
|---|---|---|
| A | Hospital insurance: inpatient hospital care, skilled nursing facility care, hospice, some home health | Federal government |
| B | Medical insurance: doctor visits and other outpatient care | Federal government |
| C (Medicare Advantage) | Part A and Part B benefits through one plan | Private insurers |
| D | Prescription drug coverage | Private insurers |
Part A is premium-free for most people, because they worked and paid Medicare taxes for at least 40 quarters, or 10 years. Even so, you still pay costs through deductibles, coinsurance, and copays. Part B is medical coverage that you pay a monthly premium for. It's optional, but delaying it can cost you later, as section 5 explains.
Part C, called Medicare Advantage, is an alternative to Original Medicare. Private companies must offer the same benefits as Parts A and B, but they can set different rules, costs, and restrictions. Some Medicare Advantage plans also include Part D drug coverage.
Part D is prescription drug coverage sold by private insurers. Premiums vary by plan, so comparing plans carefully matters more here than it does with the other parts of Medicare.
3. Original Medicare vs. Medicare Advantage
Most people face one big choice: get your coverage through Original Medicare or through a Medicare Advantage plan. Neither is best for everyone, and each comes with trade-offs.
Original Medicare is offered directly by the federal government, and according to the Medicare Rights Center, most doctors in the country accept it. You can also see a specialist without a referral or prior authorization. You're responsible for cost sharing, which can include premiums, deductibles, and coinsurance. To help with those costs, you can buy a Medigap policy, which is supplemental insurance with standardized benefits.
Medicare Advantage plans are run by private insurers, and the most common types are HMOs and PPOs. They must cover what Original Medicare covers, but they can apply network limits, referral rules, or prior authorization requirements. Some plans also offer extra benefits that Original Medicare doesn't cover. You still pay your Part B premium if you join a Medicare Advantage plan, and the plan may charge an additional premium on top.
Medigap policies work only with Original Medicare, not with Medicare Advantage. That means your choice between the two also decides whether Medigap is an option.
💡 Tip: Medigap has its own six-month open enrollment window, which starts once you're 65 and enrolled in Part B. Ask about it before you decide, since the timing affects your options.
4. What Medicare Costs in 2026
Medicare costs depend on which parts you choose. For 2026, the Centers for Medicare & Medicaid Services (CMS) set the standard monthly Part B premium at $202.90, up from $185.00 in 2025. The annual Part B deductible is $283, up from $257. CMS said the increases were mainly due to projected price changes and higher expected use of services.
Part A is premium-free for about 99 percent of beneficiaries. People with fewer than 30 quarters of Medicare-covered work pay a Part A premium of $565 a month in 2026. Part A also has an inpatient hospital deductible of $1,736 in 2026, which covers your share of the first 60 days of hospital care in a benefit period.
Part B premiums are also income-based. Since 2007, higher-income beneficiaries have paid more than the standard amount, so your own premium may be higher than $202.90 if your income is above the thresholds Medicare sets. Part D premiums vary by plan, and Medicare Advantage and Medigap premiums vary by insurer and plan. That's why two people with the same Part A and Part B can end up with very different monthly totals.
| 2026 amount | Cost |
|---|---|
| Part B standard monthly premium | $202.90 |
| Part B annual deductible | $283 |
| Part A inpatient hospital deductible | $1,736 |
⚠️ Heads-up: These are 2026 amounts. CMS updates them every year, so check Medicare.gov for the amounts that apply when you enroll.
5. When to Sign Up, and What Happens If You're Late
Your first chance to sign up is your Initial Enrollment Period. It lasts seven months. It begins three months before the month you turn 65, includes your birthday month, and ends three months after that month. If you qualify for premium-free Part A, that coverage starts the month you turn 65.
If you're 65 or older and receive Social Security benefits, you're automatically enrolled in Part A, according to the Social Security Administration. If you haven't applied for Social Security, you need to contact the agency during your enrollment period to sign up. If you or your spouse are still working and have health insurance through an employer, you may be able to delay Part B without a penalty.
Signing up late can cost you for life. For Part B, the penalty is 10 percent for each full 12-month period you could have signed up but didn't. If you wait two years, you pay 20 percent more than the standard premium, which is $243.48 a month in 2026 instead of $202.90. You pay that penalty for as long as you have Part B. For Part D, the penalty is 1 percent per full month without creditable drug coverage.
If you miss your window, you generally have to wait for the General Enrollment Period, which runs January 1 through March 31. Each fall, people already on Medicare can also review their plans during the Annual Enrollment Period, which runs October 15 through December 7.
💡 Tip: Sign up early in your seven-month window. Your start date depends on the month you sign up, so waiting can delay your coverage.
Key Takeaways
- Medicare covers people 65 and older, certain younger people with disabilities, and people with end-stage renal disease, regardless of income.
- Parts A and B are Original Medicare, while Parts C and D are sold by private insurers.
- In 2026, the standard Part B premium is $202.90 a month, and the Part B deductible is $283, though higher-income beneficiaries pay more.
- Your seven-month Initial Enrollment Period is the key date, because late penalties can last as long as you have coverage, so knowing what is Medicare's calendar matters as much as knowing its parts.
If you're approaching 65, mark your Initial Enrollment Period first, since that date drives everything else. If you have a job with health insurance, ask whether you can delay Part B without a penalty. Either way, compare Original Medicare and Medicare Advantage side by side before you choose, and confirm current amounts on Medicare.gov.
Frequently Asked Questions (FAQ)
Q. What is Medicare and who qualifies?
A. Medicare is the federal health insurance program for people 65 and older, certain younger people with disabilities, and people with end-stage renal disease. Eligibility isn't based on income.
Q. Is Medicare free?
A. Part A is premium-free for most people. Part B has a monthly premium, which is $202.90 in 2026, and a $283 annual deductible. Part D, Medicare Advantage, and Medigap premiums vary by plan, and Original Medicare also involves deductibles and coinsurance.
Q. When should I sign up for Medicare?
A. Sign up during your seven-month Initial Enrollment Period, which begins three months before the month you turn 65. You may be able to delay Part B without a penalty if you have qualifying employer coverage. If you miss your window, the General Enrollment Period runs January 1 through March 31, and a late penalty may apply.
Q. What is the difference between Original Medicare and Medicare Advantage?
A. Original Medicare is Parts A and B, offered by the federal government. Medicare Advantage is offered by private insurers, must cover the same benefits, and can add network and authorization rules. Medigap works only with Original Medicare, so that choice also affects your supplemental options.
My Take
In my view, the hardest part of Medicare isn't the four parts. It's the calendar. Most of the costly mistakes come from missing a window, not from choosing the wrong plan, and penalties can follow you for as long as you have coverage. That's why the sign-up dates deserve more of your attention than the plan names. If you're approaching 65, write down your seven-month window now and check whether an employer plan lets you delay Part B. Then confirm the details on Medicare.gov or at 1-800-MEDICARE before you decide. Your own situation, including any employer coverage and the doctors you already see, can change which choice makes sense.
Disclaimer: This article is for general informational purposes only. Dates, prices, rules, and event or store policies can change, and safety, health, money, and legal situations differ from person to person. Check the official sources linked below, or a qualified professional, before you decide.
How this article was made: We researched official and reputable public sources, drafted this article with the help of AI tools, and had it reviewed by the author before publishing.
Sources
- CMS: 2026 Medicare Parts A & B Premiums and Deductibles
- Medicare.gov: Avoid Late Enrollment Penalties
- Medicare.gov: When Does Medicare Coverage Start?
- Social Security Administration: When to Sign Up for Medicare
- Medicare Rights Center: What Is Medicare?
- Washington, D.C. Department of Aging and Community Living: Medicare FAQ
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