Medicare starts at age 65 for most people

You become may be able to access for Medicare the month you turn 65, regardless of whether you are still working. If your birthday falls on the first of the month, your coverage begins the month before. For any other birthday, coverage starts the first day of the month you turn 65. You do not have to retire or stop working to sign up — Medicare runs alongside employer coverage or any other insurance you have.

Some people may have access to before 65. If you have been receiving Social Security Disability Insurance (SSDI) for 24 months, you become may be able to access at any age. If you have End-Stage Renal Disease (ESRD) — permanent kidney failure requiring dialysis or transplant — you can enroll when ready, regardless of age. People with ALS (amyotrophic lateral sclerosis) also may have access to right away without a waiting period.

Key Takeaways

  • Most people become may be able to access for Medicare the month they turn 65, even if they continue working.
  • You can enroll starting three months before your 65th birthday and should do so to avoid late penalties.
  • If you have SSDI, ESRD, or ALS, you may be may be able to access before 65 without any age requirement.
  • Delaying enrollment past your initial window can result in permanent premium increases on Part B and Part D coverage.
  • Your enrollment window lasts seven months total: three months before, the month you turn 65, and three months after.

The enrollment window: when to sign up

Your Initial Enrollment Period (IEP) is seven months long and centers on the month you turn 65. It runs from three months before your birthday through three months after. For example, if you turn 65 in June, your window opens in March and closes in September. You should enroll during this window to avoid penalties and gaps in coverage.

The best time to enroll is during the three months before your birthday. This gives Medicare time to process your process and have your coverage ready on your first may be able to access day. If you miss this window and enroll after you turn 65, your coverage will not start until the first day of the following month. Waiting until the last month of your window means you might not have coverage in place when you need it.

What happens if you miss your enrollment window

If you do not enroll during your seven-month Initial Enrollment Period, you can still sign up later during the General Enrollment Period, which runs from January 1 to March 31 each year. However, coverage does not begin until July 1 of that year, creating a gap where you have no Medicare protection. This gap can be costly if you need medical care.

Missing your window also triggers late enrollment penalties that are permanent. For Part B, you pay an extra 10 percent of the standard premium for each full year you were may be able to access but not enrolled. For Part D (prescription drug coverage), you pay a 1 percent penalty per month of delay. These penalties stay with you for life, even after you finally enroll. The only exception is if you had creditable coverage — employer insurance or retiree coverage that was as good as Medicare — during the time you were not enrolled in Medicare.

Special situations that change your enrollment important date

If you are still working at 65 and your employer has 20 or more employees, you may be able to delay Medicare enrollment without penalty. This is called creditable coverage. You can stay on your employer plan and enroll in Medicare later without the late penalty, as long as you sign up within eight months of leaving the job or losing the coverage. You must tell Medicare about your employer coverage when you eventually enroll.

If you are not a U.S. citizen but are a permanent resident, you must have lived in the United States for at least five years before you can enroll. If you are a citizen living abroad, you can still enroll at 65, but you will need to provide proof of citizenship and residency status. Non-citizens and people living outside the U.S. should contact Social Security directly to confirm their specific requirements.

How to enroll in Medicare

You can enroll through three main routes: 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 fastest — you can complete it in about 10 minutes if you have your Social Security number and basic health information ready. The phone line has wait times but offers live help if you have questions during the process.

You will need your Social Security number, proof of citizenship or legal residency, and information about any current health insurance. If you are enrolling in Part D (prescription drug coverage), have a list of your current medications ready so you can compare plans. Most people do not need to visit an office in person, but you can if you prefer to work with someone face-to-face.

Medicare parts and what each covers

Part A covers hospital stays, skilled nursing care, hospice, and some home health services. Most people do not pay a monthly premium for Part A because they or their spouse paid Medicare taxes while working. Part B covers doctor visits, outpatient care, and medical equipment. Part B has a monthly premium that increases each year and is higher if you enroll late.

Part D is prescription drug coverage offered by private insurance companies approved by Medicare. You choose a plan during enrollment, and coverage varies by plan. Part C, also called Medicare Advantage, is an alternative to Original Medicare (Parts A and B) offered by private insurers. It often includes prescription drug coverage and may have lower out-of-pocket costs, but it limits which doctors and hospitals you can use. You do not have to choose Part C — it is optional, and many people stick with Original Medicare instead.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

You can enroll starting three months before your 65th birthday. You cannot enroll earlier unless you have SSDI (after 24 months), ESRD, or ALS. If you have one of these conditions, contact Social Security to begin the process as soon as you meet the requirements.

What if I am still working when I turn 65?

You can enroll in Medicare even if you are working. If your employer has 20 or more employees and offers health insurance, you may delay Part B enrollment without penalty. You must still enroll in Part A, and you should tell Medicare about your employer coverage when you eventually enroll in Part B.

Do I have to choose a Medicare plan during my enrollment window?

Yes, you must choose either Original Medicare (Part A and Part B) or Medicare Advantage (Part C). If you want prescription drug coverage, you must also choose a Part D plan. If you do not actively choose, Medicare may assign you a plan, which may not be the best fit for your needs.

What is the penalty for enrolling late in Medicare Part B?

You pay an extra 10 percent of the standard Part B premium for each full year you were may be able to access but not enrolled. This penalty is permanent and stays with you even after you sign up. The only way to avoid it is to have had creditable coverage from an employer or union during the time you were not enrolled.

Can I change my Medicare plan after I enroll?

Yes, but only during specific windows. The Annual Enrollment Period runs October 15 to December 7 each year, and changes take effect January 1. If you recently turned 65 or lost employer coverage, you may have a Special Enrollment Period that allows changes outside the annual window. Contact Medicare to confirm your options.