The Basic Age Rule for Medicare

You become may be able to access for Medicare at age 65, regardless of your work history or income. This is the standard enrollment age set by federal law. If you are already receiving Social Security benefits when you turn 65, Medicare enrollment happens automatically — you do not need to take any action. If you are not yet collecting Social Security, you will receive information in the mail about three months before your 65th birthday explaining how to sign up.

The enrollment window opens three months before the month you turn 65 and closes three months after. If you miss this window, you may face a permanent penalty on your premiums, so the timing matters. The penalty is 10 percent of your Part B premium for each full year you delayed enrollment without a valid reason.

Key Takeaways

  • Medicare may be able to access begins at age 65 for most people, and enrollment is automatic if you are already receiving Social Security.
  • Your enrollment window is seven months long: three months before your 65th birthday, the month you turn 65, and three months after.
  • Delaying enrollment past your window without a valid reason triggers a permanent 10 percent premium penalty on Part B coverage.
  • Some people under 65 may be may be able to access if they receive Social Security Disability Insurance or have end-stage renal disease or ALS.

Exceptions: Medicare Before Age 65

You may be may be able to access for Medicare before turning 65 in three specific situations. The first is if you have received Social Security Disability Insurance (SSDI) for 24 consecutive months. The 24-month waiting period starts from the month your disability benefits began, not from when you applied. Once you reach that mark, Medicare coverage begins automatically the following month.

The second exception applies if you have end-stage renal disease (ESRD) — permanent kidney failure requiring dialysis or a transplant. You become may be able to access for Medicare when ready upon diagnosis, without any waiting period. The third exception is ALS (amyotrophic lateral sclerosis), also called Lou Gehrig's disease. Unlike SSDI, you do not wait 24 months; Medicare coverage begins in the first month you receive an ALS diagnosis and start collecting disability benefits.

How to Enroll When You Turn 65

If you are already collecting Social Security, you will receive a notice in the mail and your Medicare coverage will start automatically on the first day of the month you turn 65. You do not need to do anything. Your Medicare card will arrive in the mail before your coverage begins.

If you are not yet receiving Social Security, you must enroll yourself. You can sign up online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. The enrollment window is open three months before your 65th birthday through three months after. Signing up during this window avoids the permanent premium penalty.

When you enroll, you will choose between Original Medicare (Part A and Part B) or a Medicare Advantage plan (Part C). Part A covers hospital stays; Part B covers doctor visits and outpatient care. Many people also add Part D (prescription drug coverage) or a Medigap policy to cover costs Original Medicare does not pay. These choices do not have to be made all at once, but delaying Part D enrollment also triggers a penalty if you go without creditable drug coverage.

What Happens If You Miss Your Enrollment Window

Missing your initial enrollment window does not prevent you from signing up later, but it carries financial consequences. Your Part B premium increases by 10 percent for each full year you delayed enrollment without a valid reason. This penalty is permanent — it stays with you for life, even after you finally enroll.

A valid reason to delay without penalty includes having employer health coverage through your own job or your spouse's job. If you are still working and covered by an employer plan, you can delay Medicare enrollment without penalty as long as you enroll within eight months of losing that coverage or retiring, whichever comes first. You will need to provide proof of the employer coverage when you eventually sign up.

Medicare for Non-Citizens and Recent Immigrants

To enroll in Medicare at 65, you must be a U.S. citizen or a permanent resident who has lived in the United States for at least five consecutive years. Permanent resident status is shown on a green card. If you are a non-citizen, you may still be may be able to access if you meet the residency requirement and are otherwise 65 or older.

Undocumented immigrants are not may be able to access for Medicare, regardless of age. Some states offer limited health coverage programs for undocumented residents, but these are separate from Medicare and vary by location. If you are unsure about your immigration status and may be able to access, contact your local Social Security office or call 1-800-MEDICARE to discuss your specific situation.

Planning Ahead: What to Do Before You Turn 65

Start planning three to four months before your 65th birthday. If you are not yet receiving Social Security, create an account at ssa.gov or Medicare.gov so you can enroll online when your window opens. Gather documents you may need: your birth certificate, proof of citizenship or permanent residency, and information about any current health coverage through an employer or spouse's employer.

Review your options before enrolling. Original Medicare with Part D and a Medigap policy works well for people who see many different doctors. Medicare Advantage plans often have lower premiums but require using in-network providers. The choice depends on your doctors, medications, and expected health care use. You can change your plan during the annual enrollment period (October 15 to December 7 each year), so your first choice does not lock you in forever.

Frequently Asked Questions

Can I delay Medicare enrollment if I am still working at 65?

Yes, if you have health coverage through your employer or your spouse's employer. You can delay without penalty as long as you enroll within eight months of losing that coverage or retiring. You will need to provide proof of the employer coverage when you sign up. If you are self-employed, you cannot delay based on self-employment income alone.

What if I turn 65 outside the United States?

You can still enroll in Medicare while abroad. Contact Social Security or Medicare by phone or mail to sign up. Your coverage will begin on the first day of the month you turn 65 (or the month you enroll, if that is later). Some Medicare coverage does not work outside the U.S., so review what is covered before traveling.

Do I have to take Social Security at 65 to get Medicare?

No. You can enroll in Medicare at 65 without claiming Social Security benefits. If you are not yet receiving Social Security, you must sign up for Medicare yourself through Medicare.gov, by phone, or at a Social Security office. You can claim Social Security later at any age between 62 and 70 without affecting your Medicare coverage.

What is the penalty for missing my enrollment window?

Your Part B premium increases by 10 percent for each full year you delayed enrollment without a valid reason. This penalty is permanent and applies for the rest of your life. For example, if you delay three years, your premium will be 30 percent higher than the standard rate.

Can I enroll in Medicare before 65 if I am unemployed?

No. Unemployment alone does not make you may be able to access before 65. You must meet one of the three exceptions: receiving SSDI for 24 months, having end-stage renal disease, or having ALS. If you are uninsured before 65, you may be able to purchase coverage through the Affordable Care Act marketplace at healthcare.gov.