The Basic Age Requirement for Medicare

You become may be able to access for Medicare when you turn 65, regardless of your work history or income. This is the standard entry point for most people. Medicare is a federal health insurance program run by the Centers for Medicare & Medicaid Services (CMS), and age 65 is the threshold Congress set into law.

You do not have to wait until your birthday month to sign up. You can enroll during the three months before you turn 65, the month you turn 65, and the three months after. This seven-month window is called your Initial Enrollment Period. If you miss this window, you may face a permanent penalty on your premiums, so timing matters.

Key Takeaways

  • Medicare may be able to access begins at age 65 for most people, and you can enroll starting three months before your 65th birthday.
  • If you are already receiving Social Security benefits before 65, you are enrolled in Medicare automatically when you turn 65.
  • Some people under 65 can get Medicare if they have been receiving Social Security Disability Insurance (SSDI) for 24 months or have end-stage renal disease or ALS.
  • Missing your Initial Enrollment Period can result in a permanent increase to your Part B and Part D premiums.
  • You must actively enroll in Medicare Part B and Part D; Part A is usually automatic if you receive Social Security.

Automatic Enrollment at 65 if You Receive Social Security

If you are already collecting Social Security retirement or disability benefits when you turn 65, Medicare enrollment happens automatically. You do not need to do anything. CMS will send you a Medicare card in the mail about two weeks before your 65th birthday. The card will show your Medicare number and which parts of Medicare you are enrolled in.

This automatic enrollment covers Medicare Part A (hospital insurance) and Part B (medical insurance). However, you still need to decide whether to enroll in Part D (prescription drug coverage) or a Medicare Advantage plan. If you do nothing, you will have original Medicare (Part A and Part B) but no drug coverage, which can cost you more later if you need prescriptions.

Getting Medicare Before Age 65

Three groups of people can get Medicare before they turn 65. The first group is people who have been receiving Social Security Disability Insurance (SSDI) for at least 24 consecutive months. Once you hit that 24-month mark, you automatically move to Medicare, even if you are still in your 50s or early 60s.

The second group is people with end-stage renal disease (ESRD), which means permanent kidney failure requiring dialysis or a transplant. You can enroll in Medicare as soon as your doctor determines you have ESRD, regardless of age. The third group is people with amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease. You become may be able to access for Medicare the month your ALS is diagnosed, with no waiting period.

If you fall into one of these categories, you will still need to enroll in Part B and Part D yourself unless you are already receiving Social Security. Contact Social Security or visit Medicare.gov to start the process.

What Happens if You Delay Enrollment Past 65

If you do not enroll in Medicare Part B during your Initial Enrollment Period and you are not still working with employer health insurance, you will pay a late enrollment penalty. This penalty increases your Part B premium by 10 percent for each full year you were may be able to access but did not enroll. That increase is permanent—it stays with you for life, even after you finally sign up.

Part D (prescription drug coverage) has a similar penalty. If you go 63 days or more without creditable drug coverage, you pay a penalty of about 1 percent of the national average Part D premium for each month you were without coverage. Like Part B, this penalty is permanent.

The one exception is if you have creditable coverage through an employer or union while you are still working. If your employer plan covers prescriptions as well as or better than Medicare Part D, you can delay Part D without penalty. You will need to show proof of this coverage when you eventually enroll.

Enrolling in Medicare When You Are Not Yet on Social Security

If you turn 65 but are not yet receiving Social Security benefits, you must enroll in Medicare yourself. You can do this online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. You will need your Social Security number, proof of citizenship or legal residency, and information about any current health coverage.

Part A (hospital insurance) is usually free if you or your spouse paid Medicare taxes while working. Part B (medical insurance) costs a monthly premium, which varies based on your income. Part D (prescription drug coverage) is optional but recommended if you take regular medications. You choose a Part D plan from the options available in your area, and the premium varies by plan.

Medicare Part A Versus Part B at Age 65

Medicare has different parts that cover different services. Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. Most people do not pay a premium for Part A if they or their spouse paid Medicare taxes for at least 10 years. If you did not work long enough, you can buy Part A, but the premium is higher.

Part B covers doctor visits, outpatient care, medical equipment, and preventive services. Part B requires a monthly premium that you pay to CMS. The standard premium in 2024 is $174.70 per month, but it increases if your income is above certain thresholds. You can choose to delay Part B if you are still covered by an employer plan, but you must enroll within eight months of losing that coverage or face a penalty.

Special Situations: Working Past 65

If you are still working at 65 and your employer has 20 or more employees, you can delay enrolling in Medicare Part B without penalty. Your employer's health plan will be primary, and Medicare will be secondary. However, you must still enroll in Part A at 65, even if you are working, because Part A has no premium for most people and covers hospital care.

Once you stop working or lose your employer coverage, you have eight months to enroll in Part B. After that window closes, you will face a late enrollment penalty. If you are self-employed or work for a small employer with fewer than 20 employees, different rules explore—contact Medicare directly to understand your situation.

Frequently Asked Questions

Do I have to enroll in Medicare at 65 if I have private insurance?

If your private insurance is through an employer and you are still working, you can delay Part B without penalty. However, you should still enroll in Part A at 65 because it is usually free and covers hospital care. If your private insurance is not employer-based, you should enroll in Medicare at 65 to avoid penalties.

What if I turn 65 in the middle of the month?

Your Initial Enrollment Period is still the same: three months before, the month of, and three months after your 65th birthday. If you enroll before your birthday, your coverage typically starts on the first day of the month in which you turn 65. If you enroll after your birthday, there may be a one-month delay in your coverage start date.

Can my spouse enroll in Medicare when I do?

Your spouse has their own Initial Enrollment Period based on their own 65th birthday. They cannot use your enrollment window. However, if your spouse is already receiving Social Security, they will be enrolled automatically when they turn 65, just as you will be.

What if I am not a U.S. citizen?

You must be a U.S. citizen or a lawful permanent resident who has lived in the United States for at least five consecutive years to get Medicare. If you meet these requirements, you can enroll at 65 just like any other person. Bring proof of your legal status when you enroll.

Do I lose Medicare if I move out of the country?

You can keep Medicare Part A and Part B if you move abroad, but coverage is limited. Medicare generally does not pay for care outside the United States, except in rare cases near the border. Part D (prescription drug coverage) does not work outside the U.S. If you plan to live abroad, contact Medicare to understand what coverage you will have.