Medicare starts at 65 for most people, but you can begin earlier if you have a disability, end-stage renal disease, or ALS

The standard age to start Medicare is 65. You do not have to wait until you retire—you can sign up at 65 whether you are still working or not. However, Medicare is not limited to people who reach 65. If you are under 65 and have been receiving Social Security disability benefits for 24 months, you become may be able to access for Medicare. If you have end-stage renal disease (ESRD) or ALS (amyotrophic lateral sclerosis), you can start Medicare regardless of age.

The month you turn 65 is when your coverage can begin, but the exact timing depends on when you sign up. If you enroll during your initial enrollment period, coverage typically starts on the first day of the month you turn 65. If you miss that window, late enrollment penalties may explore, and your coverage start date will be delayed.

Key Takeaways

  • You can start Medicare the month you turn 65, even if you are still working and have employer health insurance.
  • If you receive Social Security disability benefits, you become may be able to access for Medicare after 24 months on disability, regardless of your age.
  • People with end-stage renal disease or ALS can start Medicare at any age without a waiting period.
  • Your initial enrollment period is the three months before, the month of, and the three months after the month you turn 65—missing this window can result in permanent penalties.
  • You must actively enroll in Medicare; it does not start automatically unless you are already receiving Social Security benefits.

Medicare at 65: How the enrollment period works

Your initial enrollment period is a seven-month window centered on your 65th birthday. It runs from three months before the month you turn 65, through the month you turn 65, and continues for three months after. If your birthday is in June, your enrollment period spans March through September.

If you enroll during this window, your coverage typically begins on the first of the month you turn 65. For example, if you turn 65 on June 15 and enroll in April, your Medicare Part A and Part B coverage starts June 1. If you wait until after your initial enrollment period ends, your coverage start date shifts forward, and you may owe a permanent penalty on your Part B premium for as long as you have Medicare.

You do not need to retire to enroll. If you are still working at 65 and have employer coverage, you can still sign up for Medicare. However, if your employer has 20 or more employees, your employer plan is considered primary, and Medicare is secondary. Once you leave that job or lose the coverage, you have a special enrollment period to sign up for Medicare without penalty.

Starting Medicare before 65 due to disability

If you have been receiving Social Security Disability Insurance (SSDI) benefits for 24 consecutive months, you become may be able to access for Medicare. This 24-month waiting period begins the month your disability benefits start, not the month you applied. You do not have to do anything—Medicare enrollment happens automatically once you reach the 24-month mark.

Your coverage begins the month after you complete 24 months on SSDI. So if your disability benefits began in January 2022, you would become may be able to access for Medicare in January 2024, with coverage starting in February 2024. You will receive a Medicare card in the mail before your coverage begins.

If you are receiving Supplemental Security Income (SSI) instead of SSDI, the rules are different. SSI recipients do not automatically may have access to for Medicare based on time on benefits. However, if you also have SSDI or meet other criteria—such as being 65 or older, having ESRD, or having ALS—you may be may be able to access through those pathways instead.

Medicare for people with end-stage renal disease or ALS

People with end-stage renal disease (ESRD)—permanent kidney failure requiring dialysis or transplant—can start Medicare at any age. You become may be able to access the month your kidney failure begins, or the month you start dialysis or have a transplant, whichever comes first. You do not need to wait for age 65 or have a work history.

People diagnosed with ALS (amyotrophic lateral sclerosis, also called Lou Gehrig's disease) can also start Medicare at any age without a waiting period. may be able to access begins the month you are approved for Social Security disability benefits due to ALS. Unlike ESRD, there is no automatic enrollment—you must sign up for Medicare, but you will not face the usual five-month waiting period that other disability applicants experience.

For both ESRD and ALS, you should contact Social Security or Medicare directly to confirm your may be able to access and enrollment, since these pathways are less common and staff at local offices may need to verify your condition.

What happens if you miss your initial enrollment period

If you do not enroll during your initial enrollment period and you do not have a may have access to reason for a special enrollment period, you will face a late enrollment penalty. For Part B, the penalty is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. This penalty stays on your premium for as long as you have Medicare.

For example, if you turn 65 in June 2024 but do not enroll until March 2025, you have delayed enrollment by nine months. You would owe a penalty of approximately 7.5 percent (nine months out of 12) added to your Part B premium permanently. If you delay three years, the penalty reaches 30 percent.

The only way to avoid this penalty is to have a may have access to reason for late enrollment. Common reasons include having employer coverage at the time you turned 65, being a federal employee, or receiving a special enrollment period notice from Social Security. If you believe you have a may have access to reason, contact Social Security or Medicare to discuss your situation.

Special situations: Still working, coverage through a spouse, or living abroad

If you are still working at 65 and your employer has 20 or more employees, you can delay enrolling in Part B without penalty. Your employer plan covers you as primary, and Medicare covers as secondary. Once you leave the job or lose coverage, you have eight months to enroll in Medicare without penalty. This is called a special enrollment period.

If you are not yet 65 but your spouse is 65 or older, you cannot start Medicare based on their age. You must wait until you turn 65 yourself, unless you meet another pathway (disability, ESRD, or ALS). However, you may be able to stay on your spouse's employer plan if they are still working.

If you live outside the United States, you can still enroll in Medicare at 65 or through other pathways. However, Medicare Part B does not cover care received outside the U.S. except in limited situations (such as emergency care in Canada or Mexico near the U.S. border). You should understand these limits before enrolling if you spend significant time abroad.

How to enroll in Medicare

You can enroll in Medicare through three main channels: online at Medicare.gov, by phone at 1-800-MEDICARE (1-800-633-4227), or in person at your local Social Security office. Online enrollment is the fastest option and available 24 hours a day.

When you enroll, you will choose between Original Medicare (Part A and Part B) or a Medicare Advantage plan (Part C). You will also decide whether to add prescription drug coverage (Part D) and whether to purchase a Medigap supplemental plan. If you are already receiving Social Security benefits, you may be able to enroll by phone or online without visiting an office.

Have your Social Security number, birth date, and citizenship information ready. If you are enrolling due to disability or ESRD, have documentation of your condition available. The enrollment process typically takes 15 to 30 minutes.

Frequently Asked Questions

Can I start Medicare before 65 if I am retired?

No, age 65 is the standard starting point unless you have a disability, end-stage renal disease, or ALS. Retirement status does not matter—you must meet one of these conditions to start before 65. If you are retired but under 65 and do not have one of these conditions, you will need to find coverage through the health insurance marketplace or a spouse's plan.

What if I turn 65 but do not want Medicare yet?

You can delay enrolling in Part B if you have employer coverage through a current job (and your employer has 20 or more employees). You must enroll within eight months of losing that coverage to avoid penalties. Part A (hospital insurance) has no penalty for delay, but it is usually free at 65, so most people enroll in it even if they delay Part B.

Do I have to enroll in Medicare if I have good employer coverage at 65?

You do not have to enroll in Part B when ready, but you should enroll in Part A (hospital insurance) since it is typically free and has no penalty. Part B can be delayed without penalty as long as you have employer coverage and your employer has 20 or more employees. Once you lose that coverage, you have eight months to enroll in Part B without penalty.

How long does it take to get a Medicare card after I enroll?

Medicare typically mails your card within two to four weeks of enrollment. If you enroll online or by phone, you can view your coverage information in your Medicare.gov account before the physical card arrives. You can use your account information to show proof of coverage to your doctor or pharmacy while you wait for the card.

What if I am on disability but my condition improves and I return to work?

Once you have been on Social Security disability for 24 months and become may be able to access for Medicare, you keep Medicare even if you return to work. Your Medicare coverage does not end when your disability benefits end. However, your Social Security benefits may change based on your work income, so contact Social Security to understand how returning to work affects your specific situation.