Medicare starts at 65 for most people, but you may be able to enroll earlier if you have a disability, end-stage renal disease, or ALS

The standard age to enroll in Medicare is 65. You become may be able to access the month you turn 65, and you can sign up starting three months before that birthday. However, age 65 is not the only path in. If you have been receiving Social Security disability benefits for 24 months, you can enroll in Medicare regardless of your age. The same applies if you have end-stage renal disease (ESRD) or amyotrophic lateral sclerosis (ALS) — you do not have to wait until 65.

The month you become may be able to access is the month your coverage can begin. If you sign up during your initial enrollment period — which runs from three months before your 65th birthday through three months after — your coverage typically starts the first day of the month you turn 65. Missing this window can delay your coverage and trigger late-enrollment penalties that increase your premiums permanently.

Key Takeaways

  • You can enroll in Medicare starting three months before you turn 65, and coverage begins the first day of the month you turn 65 if you sign up on time.
  • If you receive Social Security disability benefits, you become Medicare-may be able to access after 24 months on disability, regardless of your age.
  • People with end-stage renal disease or ALS can enroll in Medicare at any age without waiting for disability benefits or turning 65.
  • Signing up late outside your initial enrollment period results in permanent premium increases for Part B and Part D coverage.

How the 65-year-old enrollment window works

Your initial enrollment period is a seven-month window: three months before the month you turn 65, the month you turn 65, and three months after. During this time, you can sign up for Medicare Part A (hospital insurance) and Part B (medical insurance) without penalty.

If you are still working at 65 and have health insurance through your employer, you may be able to delay Part B enrollment without penalty — but only if your employer has 20 or more employees. This is called the special enrollment period for group health plan coverage. You will need to provide proof of your employer coverage when you eventually sign up for Part B. If your employer has fewer than 20 employees, you should enroll in Part B at 65 even if you have other coverage, or you will face a late-enrollment penalty.

You can sign up for Medicare online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. The process takes about 10 minutes online.

Medicare may be able to access before 65: disability benefits

If you have been receiving Social Security Disability Insurance (SSDI) for 24 consecutive months, you become Medicare-may be able to access at that point, no matter your age. The 24 months are counted from the date your disability benefits began, not from the date you applied. Once you hit 24 months, you can enroll in Medicare when ready.

You do not have to do anything special to trigger this — Social Security will contact you automatically when you reach 24 months. However, you still need to actually sign up for Medicare. Some people assume they are automatically enrolled, but they are not. You must contact Social Security or Medicare to complete your enrollment.

If you are receiving Supplemental Security Income (SSI) instead of SSDI, the rules are different. SSI recipients become Medicare-may be able to access at 65, the same as everyone else, unless they also may have access to through another route like ESRD.

Medicare may be able to access before 65: ESRD and ALS

End-stage renal disease (ESRD) is permanent kidney failure requiring dialysis or a transplant. If you have ESRD, you can enroll in Medicare at any age. Your coverage can begin the first day of the month you start dialysis, or the month of your kidney transplant, whichever comes first. You do not need to wait 24 months or reach any age threshold.

Amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease, also qualifies you for when ready Medicare enrollment at any age. Unlike ESRD, you do not need to meet any treatment milestone — diagnosis alone is sufficient. Your coverage can begin the first day of the month you are diagnosed.

If you have either condition, your doctor or dialysis center can help you understand the enrollment process. Social Security will need medical documentation, but the process moves faster than standard disability claims because the medical criteria are already established.

What happens if you miss your enrollment window

If you do not sign up for Part B during your initial enrollment period and you do not may have access to for a special enrollment period, you will pay a late-enrollment penalty for as long as you have Part B coverage. The penalty is 10 percent of the standard Part B premium for each full 12-month period you were may be able to access but not enrolled. If you were may be able to access for three years before signing up, your premium increases by 30 percent permanently.

The same penalty applies to Part D (prescription drug coverage). If you go 63 days or longer without creditable drug coverage, you pay a penalty when you enroll. The penalty is based on how long you went without coverage and changes each year.

Part A (hospital insurance) does not carry a late-enrollment penalty if you have worked long enough to earn Part A coverage through your own or your spouse's work history. However, if you do not have enough work credits, you may have to pay a premium for Part A, and that premium increases if you enroll late.

Enrolling before 65 if you are still working

If you are still working and covered by your employer's health plan, you have options. You can delay Part B enrollment without penalty if your employer has 20 or more employees. When you eventually leave your job or lose that coverage, you have eight months to sign up for Part B without penalty — this is your special enrollment period.

Part A is different. Even if you are working and have employer coverage, you can enroll in Part A at 65 with no penalty. Many people do this because Part A is usually free if you have 40 work credits (roughly 10 years of work). Enrolling in Part A does not affect your employer coverage.

If your employer has fewer than 20 employees, you should enroll in Part B at 65 even if you have other insurance. Delaying in this situation triggers a penalty.

Special situations: government employees and railroad workers

If you worked for the federal government and are covered under the Federal Employees Health Benefits Program (FEHB), you can delay Part B enrollment without penalty while you have FEHB coverage. The same rule applies to Railroad Retirement Board (RRB) beneficiaries with employer coverage. Once your coverage ends, you have eight months to enroll in Part B penalty-free.

Government employees who did not pay into Social Security may have different Part A rules. If you did not pay Social Security taxes, you may not be may be able to access for free Part A at 65. Contact Social Security directly to understand your specific situation, as these rules vary by employment type and when you were hired.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65 if I do not have a disability?

No, unless you have end-stage renal disease or ALS. If you are under 65 and do not have one of these conditions, you cannot enroll in Medicare. You would need to maintain private insurance or coverage through your employer until you turn 65.

What if I turn 65 while I am still working?

You can still enroll in Medicare at 65. If your employer has 20 or more employees and you have health coverage through them, you can delay Part B without penalty. Part A can usually be enrolled in with no effect on your employer coverage. Check with your employer's benefits office about how Medicare enrollment affects your coverage.

Do I automatically get Medicare when I turn 65?

No. You must sign up. If you are already receiving Social Security retirement benefits, you will be automatically enrolled in Part A and Part B the month you turn 65. If you are not yet receiving Social Security, you must contact Medicare or Social Security to enroll.

How long does it take to enroll in Medicare?

Online enrollment through Medicare.gov takes about 10 minutes. Phone enrollment with 1-800-MEDICARE typically takes 15 to 20 minutes. Coverage usually begins the first day of the month you turn 65 if you enroll during your initial enrollment period.

What if I miss the three-month window before my 65th birthday?

You can still enroll during the three months after your birthday without penalty. Your coverage will start the first day of the month you enroll. If you miss the entire seven-month window, you will face late-enrollment penalties on Part B and Part D that remain on your premiums permanently.