What Age You Need to Be for Medicare Coverage

Medicare starts at age 65 for most people

You become may be able to access for Medicare at age 65, regardless of your work history or income. This is the standard age set by federal law. You do not have to be retired to sign up — you only need to reach 65.

The month you turn 65, you enter your Initial Enrollment Period, a seven-month window that runs from three months before your birthday through three months after. During this window, you can sign up for Medicare Part A (hospital insurance) and Part B (medical insurance) without penalty. If you miss this window, you may pay higher premiums for the rest of your life.

Some people become may be able to access before 65 under specific circumstances. If you have been receiving Social Security Disability Insurance (SSDI) for 24 months, you can get Medicare at any age. If you have End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS), you may also may have access to before 65, though the rules differ for each condition.

Key Takeaways

The standard Medicare age is 65, and you can sign up starting three months before your birthday.
Your Initial Enrollment Period lasts seven months — three months before your 65th birthday through three months after — and missing it can cost you in higher premiums later.
You can get Medicare before 65 if you have been on SSDI for 24 months, have ESRD, or have ALS.
You should sign up during your Initial Enrollment Period even if you are still working, because waiting can trigger permanent premium increases.

How to sign up during your Initial Enrollment Period

You can sign up for Medicare through three main routes: online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. The online method is fastest — you can complete the process in about 10 minutes if you have your Social Security number and birth date ready.

If you are already receiving Social Security benefits, Medicare will contact you automatically about three months before your 65th birthday. You do not have to do anything — you will be enrolled in Part A and Part B unless you decline. If you are not yet receiving Social Security, you will need to contact Medicare yourself to sign up.

Bring or have ready your Social Security number, proof of citizenship or legal residency (a birth certificate, passport, or naturalization papers work), and proof of residence (a utility bill or lease agreement). The process takes longer in person than online, but staff can answer questions as you go.

What happens if you sign up late

If you do not sign up during your Initial Enrollment Period and you do not have a valid reason for the delay, you will pay a late enrollment penalty on your Part B premiums. This penalty is 10 percent of the standard Part B premium for each full 12-month period you were not enrolled. The penalty stays on your premiums permanently — it does not go away after a certain number of years.

For example, if you turn 65 in January and do not sign up until the following October (nine months late), you will owe a penalty. The exact amount depends on what the Part B premium is at the time you enroll, which changes each year. You can avoid this penalty by signing up during your Initial Enrollment Period, even if you do not plan to use Medicare right away.

Part A (hospital insurance) does not usually carry a late enrollment penalty if you have been covered by employer health insurance while working. Part D (prescription drug coverage) does carry a late enrollment penalty if you go without creditable coverage, so do not skip it if you take medications regularly.

Staying on your employer plan after 65

If you are still working at 65 and your employer offers health insurance, you may be able to delay Medicare without penalty. This is called creditable coverage. You can stay on your employer plan and sign up for Medicare later, as long as your employer has 20 or more employees.

When you do leave your job or lose employer coverage, you have eight months to sign up for Medicare without a late enrollment penalty. This eight-month window is called your Special Enrollment Period. You will need to provide proof that you had employer coverage — usually a letter from your employer or a copy of your health insurance card.

If your employer has fewer than 20 employees, the rules are different. You should sign up for Medicare at 65 even if you are still working, because you may not have the same protection against late enrollment penalties. Ask your employer's benefits department how many employees the company has before deciding to delay.

Medicare before age 65: SSDI, ESRD, and ALS

If you have been receiving SSDI for 24 consecutive months, you become may be able to access for Medicare automatically. You do not have to do anything — Social Security will enroll you in Part A and Part B. The 24-month waiting period starts from the month you first became may be able to access for SSDI, not from the month you applied. This means some people become may be able to access for Medicare before they realize it.

If you have End-Stage Renal Disease (ESRD) — permanent kidney failure requiring dialysis or a transplant — you can get Medicare at any age. You must sign up yourself; Social Security will not enroll you automatically. You have a three-month Initial Enrollment Period starting the month your kidney disease is diagnosed, the month dialysis begins, or the month of your transplant, whichever comes first.

If you have been diagnosed with Amyotrophic Lateral Sclerosis (ALS, also called Lou Gehrig's disease), you can get Medicare when ready without waiting. You do not have to be receiving SSDI first. Contact Social Security to sign up as soon as you have a diagnosis from a doctor.

What Medicare covers at different ages

Medicare coverage is the same whether you sign up at 65 or later — your age does not change what the program covers. Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. Part B covers doctor visits, outpatient care, lab tests, and some preventive services. Part D covers prescription drugs if you choose to enroll.

At 65, you also become may be able to access for certain preventive services at no cost, such as a yearly wellness visit, cancer screenings, and cardiovascular disease screenings. These services are covered by Part B. You do not have to wait until you are older to receive them — they are available as soon as you turn 65 and enroll.

Supplemental insurance (called Medigap) and Medicare Advantage plans (Part C) are also available at 65. You have the best rates and broadest choice of Medigap plans during your Initial Enrollment Period. If you wait to buy Medigap later, insurers can charge you more or deny you coverage based on your health history.

Frequently Asked Questions

Can I sign up for Medicare before I turn 65?

You can contact Medicare up to three months before your 65th birthday to begin the sign-up process, but your coverage will not start until the month you turn 65. If you have SSDI, ESRD, or ALS, different rules explore and you may be able to get Medicare earlier. Call 1-800-MEDICARE to learn about you may have access to under these conditions.

What if I am still working at 65 and do not need Medicare yet?

If your employer has 20 or more employees and offers health insurance, you can delay Medicare without penalty. When you leave your job, you have eight months to sign up. If your employer has fewer than 20 employees, sign up at 65 anyway to avoid a permanent late enrollment penalty.

Do I have to sign up for all four parts of Medicare?

Part A and Part B are the core of Medicare. Part D (prescription drugs) is optional but recommended if you take medications — skipping it can cost you in late enrollment penalties. Part C (Medicare Advantage) is an alternative to Parts A and B, not an addition to them.

What happens to my health insurance when I turn 65?

Your current health insurance does not automatically end at 65. If you have employer coverage, it continues unless you or your employer end it. You should coordinate your Medicare sign-up with any changes to your employer plan. If you have individual insurance, you can keep it alongside Medicare, but Medicare becomes your primary coverage.

Can I change my Medicare choices after I sign up?

Yes, but only during certain windows. You have an annual open enrollment period from October 15 to December 7 each year to change plans. If you have a may have access to life event — such as losing employer coverage, moving, or getting married — you may have a Special Enrollment Period outside the annual window.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.