The Main Ages and Life Events That Let You Enroll

You can enroll in Medicare when you turn 65, even if you are still working. You can also enroll before 65 if you have been receiving Social Security Disability Insurance (SSDI) for 24 months, or if you have end-stage renal disease or ALS (amyotrophic lateral sclerosis). Outside of these situations, you will need to wait until 65 or until a may have access to life event occurs — a change in your circumstances that Medicare treats as a reason to enroll outside the normal window.

The timing matters because Medicare has enrollment periods — specific windows when you can sign up without penalty. If you miss your window and do not have a may have access to reason, you may pay a permanent surcharge on your premiums for as long as you have Medicare. Understanding when you can enroll and when you must enroll are two different things, and the difference can cost you money.

Key Takeaways

  • You can enroll in Medicare starting three months before the month you turn 65, and you have until three months after that month to sign up without penalty.
  • If you are still working at 65 and have health insurance through your job, you may be able to delay Medicare Part B without paying a penalty, but you must tell Medicare about your work coverage.
  • may have access to life events — such as losing employer coverage, moving to a new state, or getting married — open a 60-day window to enroll outside your initial period.
  • If you miss your enrollment window and have no may have access to event, you will pay a permanent 10 percent surcharge on Part B premiums and a 1 percent surcharge on Part D premiums for each year you were late.
  • You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

Enrollment at Age 65: Your Initial Enrollment Period

Your Initial Enrollment Period (IEP) is a seven-month window centered on the month you turn 65. It starts three months before that month and ends three months after. For example, if you turn 65 in June, your IEP runs from March through September.

You should enroll during this window if you plan to take Medicare Part A (hospital insurance) or Part B (medical insurance) at 65. Even if you do not need the coverage right away, enrolling on time protects you from penalties later. Part A has no monthly premium for most people, so there is no cost to enrolling. Part B does have a premium, but delaying it without a valid reason will result in a permanent surcharge.

If you enroll in the first three months of your IEP (before the month you turn 65), your coverage starts the month you turn 65. If you enroll in the month you turn 65 or later, your coverage may start the following month. This timing difference is why enrolling early in your window is usually the safer choice.

Working Past 65: When You Can Delay Part B

If you are still working at 65 and have health insurance through your employer or your spouse's employer, you may be able to delay Medicare Part B without paying a penalty. This is called creditable coverage — your employer plan is considered as good as or better than Medicare Part B.

To use this exception, you must tell Medicare that you have work coverage. You do this by enrolling in Part A at 65 (which has no penalty for delay) but not enrolling in Part B. Keep proof of your employer coverage — your insurance card, a letter from your employer's benefits office, or your plan documents. When you leave your job or lose that coverage, you will have eight months to enroll in Part B without penalty. This eight-month window is called your Special Enrollment Period (SEP).

If you do not tell Medicare about your work coverage and you do not enroll in Part B at 65, you will be charged a penalty when you finally do enroll. The penalty is 10 percent of the Part B premium for each year you were not enrolled. That surcharge stays with you for life.

may have access to Life Events That Open New Enrollment Windows

If you miss your Initial Enrollment Period, you can still enroll during a Special Enrollment Period (SEP) if you have a may have access to life event. Medicare recognizes several events as reasons to enroll outside the normal window. The most common are losing employer health coverage, moving to a different state, getting married or divorced, and changes to Medicaid coverage.

When a may have access to event happens, you usually have 60 days from the date of the event to enroll in Medicare. For example, if you lose your job and your employer coverage ends on March 15, your 60-day window runs from March 15 through May 14. You will need to document the event — a termination letter, a notice from your employer's benefits office, or a court order for divorce — so keep those papers.

Not every change in your life opens a Special Enrollment Period. Turning 65 is not a may have access to event (that is your Initial Enrollment Period). Retiring is not a may have access to event unless you also lose health coverage. Moving to a new state is a may have access to event only if your current Medicare plan does not serve your new state. If you are unsure whether your situation qualifies, call 1-800-MEDICARE and describe what happened.

The Penalty for Missing Your Enrollment Window

If you do not enroll in Part B during your Initial Enrollment Period or a Special Enrollment Period, and you have no other may have access to reason to delay, you will pay a permanent surcharge called a late enrollment penalty. The penalty is 10 percent of the Part B premium for each full 12-month period you were not enrolled. If you were not enrolled for three years, your penalty is 30 percent of the current Part B premium, and you will pay it for as long as you have Medicare.

Part D (prescription drug coverage) has a similar penalty: 1 percent of the national average Part D premium for each month you were not enrolled. These penalties are permanent — they do not go away after a certain number of years. The only way to avoid them is to enroll during an open enrollment window or to have a may have access to life event that opens a Special Enrollment Period.

How to Enroll When Your Window Opens

You can enroll in Medicare through three main routes. The easiest for most people is online at Medicare.gov. Go to the site, click "Sign up for Medicare," and follow the steps. You will need your Social Security number, your date of birth, and information about any current health coverage you have. The online process usually takes 10 to 15 minutes.

You can also call 1-800-MEDICARE (1-800-633-4227). A representative can walk you through the enrollment process over the phone and answer questions about which parts of Medicare you need. The line is open Monday through Friday, 8 a.m. to 8 p.m. Eastern time, and on Saturday, 9 a.m. to 1 p.m. Eastern time.

A third option is to visit your local Social Security office in person. You can find the office nearest you at ssa.gov. Bring your Social Security card, proof of citizenship or legal residency (such as a passport or birth certificate), and proof of your current address (such as a utility bill or lease). An employee can help you enroll and answer questions about your specific situation.

What to Ask Your Doctor Before You Turn 65

Before your enrollment window opens, talk with your primary care doctor about your Medicare options. Ask whether your current doctors take Medicare. Ask whether any medications you take are covered under Medicare Part D, and whether there are any gaps in coverage you should know about. If you have a chronic condition that requires specialist care, ask whether those specialists are in-network for the Medicare plans you are considering.

If you are still working at 65, ask your employer's benefits office whether your health plan is considered creditable coverage by Medicare. Get the answer in writing if possible. This protects you if there is ever a dispute about whether you were may have access to to delay Part B.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

Yes, if you have been receiving SSDI for 24 months, or if you have end-stage renal disease or ALS. Otherwise, you must wait until your Initial Enrollment Period, which begins three months before you turn 65. If you have a may have access to life event before 65, such as losing employer coverage, you may be able to enroll then.

What happens if I enroll late but have a good reason?

If you have a may have access to life event — such as losing health coverage or moving to a new state — you have 60 days from the date of the event to enroll without penalty. You will need to document the event. If your reason does not may have access to, you will owe a late enrollment penalty even if you had a good personal reason for the delay.

Do I have to enroll in Part A and Part B at the same time?

No. You can enroll in Part A without Part B if you are still working and have employer coverage. You can also enroll in Part B without Part A, though most people enroll in both. Each part has its own enrollment rules and its own penalties for late enrollment.

What if I miss my enrollment window and cannot find a may have access to event?

Call 1-800-MEDICARE and explain your situation. Medicare sometimes grants exceptions for people who had circumstances beyond their control, such as severe illness or a language barrier. An exception is not may provide, but it is worth asking about before you accept a permanent penalty.

Can I change my mind after I enroll?

Yes, during the annual open enrollment period from October 15 through December 7, you can switch between Medicare Advantage and Original Medicare, or change your Part D plan. You can also make changes if you have a may have access to life event. Outside these windows, changes are limited.