The Minimum Age for Medicare and Who Can Enroll Before 65

The standard Medicare age is 65, but you may be able to enroll earlier under specific circumstances

Medicare may be able to access begins at age 65 for most people. However, you can enroll before 65 if you have been receiving Social Security Disability Insurance (SSDI) for 24 months, if you have end-stage renal disease (ESRD), or if you have amyotrophic lateral sclerosis (ALS). Each of these routes has different timing and requirements.

The month you turn 65, you become may be able to access to enroll in Medicare Part A (hospital insurance) and Part B (medical insurance). If you do not enroll when you first become may be able to access, you may face a permanent penalty on your Part B premiums. The enrollment window opens three months before the month you turn 65 and closes three months after.

Key Takeaways

You can enroll in Medicare at 65, or earlier if you have been on SSDI for 24 months, have ESRD, or have ALS.
If you delay enrollment past your initial window without a valid reason, you will pay a higher Part B premium for the rest of your life.
SSDI recipients are automatically enrolled in Medicare after 24 months on the program; you do not need to take action.
People with ESRD or ALS can enroll in Medicare regardless of age, but the timing depends on when treatment or diagnosis occurs.

Enrolling at 65: The standard timeline

Your initial enrollment period (IEP) runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after. You can enroll online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

If you are still working and covered by an employer health plan, you may be able to delay Part B enrollment without penalty if your employer has 20 or more employees. This is called creditable coverage. You will need to show proof of your employer coverage when you do enroll, so keep your plan documents.

If you miss your initial enrollment period and do not have creditable coverage, you will pay a permanent 10 percent increase to your Part B premium for each full year you were may be able to access but not enrolled. This penalty stays with you even if you switch plans later.

SSDI recipients: Automatic enrollment after 24 months

If you receive SSDI, you are automatically enrolled in Medicare Part A and Part B once you have been on the program for 24 consecutive months. You do not need to explore or take any action. Social Security will send you a Medicare card in the mail about three months before your 24-month mark.

Your Medicare coverage begins on the first day of the month after your 24-month period ends. For example, if you have been on SSDI for 24 months as of June 30, your Medicare coverage starts July 1. You can check your SSDI status and expected Medicare enrollment date by logging into your Social Security account at ssa.gov or calling 1-800-772-1213.

End-stage renal disease: Medicare at any age

If you have end-stage renal disease (ESRD) and need dialysis or a kidney transplant, you can enroll in Medicare regardless of your age. Your coverage begins either the first day of the month you start dialysis treatment, the first day of the month you have a kidney transplant, or the first day of the third month after you start a self-dialysis training program — whichever comes first.

You will need to provide medical documentation of your ESRD diagnosis to Medicare. Your nephrologist or dialysis center can help you gather the necessary records. Once Medicare receives your process and supporting documents, enrollment typically takes two to four weeks.

ALS: Medicare coverage from diagnosis

Amyotrophic lateral sclerosis (ALS) is the only disease that qualifies you for when ready Medicare enrollment at any age. Your coverage begins the first day of the month in which you are diagnosed with ALS, or the first day of the following month if you explore after your diagnosis month.

You will need a statement from your doctor confirming the ALS diagnosis. Unlike SSDI or ESRD, there is no waiting period — you become may be able to access the moment your diagnosis is documented. Contact Medicare at 1-800-MEDICARE to start the enrollment process, or ask your neurologist's office to help you submit the necessary medical records.

What happens if you miss your enrollment window

If you do not enroll during your initial enrollment period and do not have creditable coverage through an employer or union, you will face a late enrollment penalty. For Part B, this is a 10 percent increase to your monthly premium for each full year you were may be able to access but not enrolled. This penalty is permanent and applies even after you eventually enroll.

There are limited exceptions. If you were covered by an employer plan with 20 or more employees, you have an eight-month special enrollment period after your coverage ends or your employment ends. If you can prove you received incorrect information from Medicare or Social Security, you may be able to request a waiver, but this requires documentation and is not may provide.

Part A versus Part B: Different rules for each

Part A (hospital insurance) has no premium for most people if you or your spouse paid Medicare taxes for at least 10 years. You can enroll in Part A without enrolling in Part B, and there is no penalty for delaying Part A enrollment if you have creditable coverage.

Part B (medical insurance) does have a monthly premium and is where the late enrollment penalty applies. If you delay Part B enrollment past your initial window without creditable coverage, the penalty sticks with you permanently. Part D (prescription drug coverage) also has a late enrollment penalty if you go 63 or more days without coverage, so do not overlook it when you turn 65.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65 if I am not on SSDI?

No, unless you have ESRD, ALS, or have been on SSDI for 24 months. If you are under 65 and do not fall into one of these categories, you will need to wait until you turn 65 to enroll. If you need coverage before then, you may be able to purchase a plan through the Affordable Care Act marketplace.

What if I turn 65 while still working?

You can still enroll in Medicare at 65 even if you are working. If your employer has 20 or more employees and provides health insurance, you may delay Part B enrollment without penalty. However, you should still enroll in Part A, which has no premium for most people and covers hospital care.

Do I have to enroll in Part D when I turn 65?

You do not have to enroll in Part D at 65, but if you go without creditable prescription drug coverage for 63 or more days, you will pay a permanent penalty when you do enroll. If you do not take prescription medications, you may choose to skip Part D, but document your decision in case you need coverage later.

How do I know if my employer coverage counts as creditable?

Your employer or union should provide you with a notice each year stating whether your coverage is creditable for Medicare purposes. If you are unsure, contact your benefits administrator or call Medicare at 1-800-MEDICARE. Keep this documentation — you will need it if you delay Part B enrollment.

What if I was on SSDI but my benefits stopped before 24 months?

If your SSDI benefits end before you reach the 24-month mark, you do not automatically may have access to for Medicare. You will need to wait until you turn 65 to enroll, unless you have ESRD or ALS. If your benefits were reinstated, the 24-month clock may restart depending on the reason for the interruption — contact Social Security to confirm your status.

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.