The Standard Age to Start Medicare

You become may be able to access for Medicare on the first day of the month you turn 65, regardless of whether you have retired. If your birthday falls on the first of the month, coverage begins that day. If your birthday is any other day, coverage starts on the first day of the following month.

You do not have to be working or not working to receive Medicare at 65. You do not have to stop working. The program is available to you straightforward because you have reached that age and meet the citizenship requirements — you must be a U.S. citizen or a lawful permanent resident who has lived in the country for at least five consecutive years.

Enrollment does not happen automatically. You must sign up during your enrollment window, or you may face a permanent penalty on your premiums. The standard enrollment period runs for three months: the month you turn 65, the month before, and the month after.

Key Takeaways

  • Medicare may be able to access begins the first day of the month you turn 65, but you must sign up during your enrollment window or face a permanent premium penalty.
  • Your standard enrollment period is three months: the month before you turn 65, the month you turn 65, and the month after.
  • If you are still working and have health coverage through your employer, you may be able to delay Part B enrollment without penalty under special rules.
  • You can sign up online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
  • Missing your enrollment window can result in a permanent 10 percent increase to your Part B premium for each year you delayed.

Enrolling Before Age 65

You should begin the enrollment process three months before you turn 65. This gives you time to gather documents, review your options, and complete the sign-up without rushing.

The Social Security Administration will send you a notice in the mail about three months before your 65th birthday. This notice includes information about Medicare and your enrollment options. If you do not receive this notice, you can start the process yourself by visiting Medicare.gov or calling 1-800-MEDICARE.

You will need your Social Security number, proof of citizenship or lawful permanent residency, and information about any current health coverage you have. If you are still working and covered by an employer plan, bring details about that coverage — this affects which parts of Medicare you should enroll in and when.

Special Rules If You Are Still Working

If you are covered by a health plan through your current employer or your spouse's current employer when you turn 65, you may delay enrolling in Medicare Part B without penalty. This is called the special enrollment period for group health plan coverage.

To use this rule, your employer plan must be based on your own current employment or your spouse's current employment — not on a former job. Coverage through a retiree plan does not count. You must also be actively working, not just receiving benefits from a past job.

When you do leave that job or lose the employer coverage, you have eight months to enroll in Medicare Part B without penalty. If you miss this window, you will owe the permanent 10 percent monthly premium increase for each year you delayed. You should enroll as soon as you know your employer coverage is ending.

Enrolling After You Miss Your Initial Window

If you did not sign up during your standard enrollment period and you do not may have access to for a special enrollment period, you can still enroll in Medicare, but you will face a permanent penalty.

You can enroll during the General Enrollment Period, which runs from January 1 to March 31 each year. Coverage would begin July 1 of that year. However, your Part B premium will be permanently higher — 10 percent more for each full year you delayed past your initial enrollment window.

For example, if you turned 65 in 2022 and did not enroll until 2024, you delayed for two years. Your Part B premium would be 20 percent higher than the standard amount for as long as you have Medicare. This penalty does not go away.

Medicare Parts and When Coverage Begins

Medicare has four parts, and they do not all start on the same date. Part A (hospital insurance) and Part B (medical insurance) are the main parts most people enroll in. Part D (prescription drug coverage) and Part C (Medicare Advantage) are optional add-ons with their own enrollment rules.

Part A and Part B coverage typically begin on the first day of the month you turn 65, as long as you enroll during your standard enrollment period. If you enroll late, coverage begins the first day of the month after your enrollment is processed.

Part D enrollment follows the same three-month window as Part A and B. If you do not enroll in Part D when you first become may be able to access and you do not have other creditable prescription drug coverage, you will pay a permanent penalty when you do enroll — approximately 1 percent of the national average Part D premium for each month you delayed.

What Happens If You Turn 65 While Still Employed

Turning 65 does not require you to retire or stop working. Many people continue working past 65 and keep their employer health coverage. You can do both — keep working and enroll in Medicare.

If you have employer coverage and enroll in Medicare, Medicare becomes your secondary payer. This means your employer plan pays first for covered services, and Medicare pays second. You still need to enroll in Medicare during your window to avoid penalties, even if you are using employer coverage as your primary insurance.

Your employer is required to tell you how their plan coordinates with Medicare. Ask your benefits administrator for this information before you turn 65 so you understand how both plans will work together.

Documents You Will Need to Enroll

Gather these documents before you start the enrollment process. Having them ready speeds up the sign-up, whether you enroll online, by phone, or in person.

  • Your Social Security number
  • Proof of U.S. citizenship (birth certificate, passport, or naturalization papers) or proof of lawful permanent residency
  • Information about any current health coverage (employer plan, COBRA, private insurance, or Medicaid)
  • A list of your current doctors and hospitals, if you want to check whether they are in-network for a Medicare Advantage plan
  • A list of your current medications, if you want to review Part D drug coverage options

Where to Enroll in Medicare

You have three main ways to enroll: online, by phone, or in person. All three routes reach the same system and produce the same result.

Online: Visit Medicare.gov and select "Sign up for Medicare." You can complete the entire process on your computer or phone. You will receive a confirmation number at the end.

By phone: Call 1-800-MEDICARE (1-800-633-4227). Representatives are available Monday through Friday, 8 a.m. to 8 p.m. Eastern time. They can answer questions and help you enroll over the phone. Have your documents ready when you call.

In person: Visit your local Social Security office. You can find the nearest office at ssa.gov or by calling 1-800-772-1213. Bring your documents with you. No appointment is required, but wait times vary.

Frequently Asked Questions

What if I turn 65 in the middle of the month?

Your Medicare coverage will begin on the first day of the following month. For example, if you turn 65 on March 15, your coverage starts April 1. Your enrollment window is still three months: February, March, and April.

Can I delay Medicare if I am still working and have employer coverage?

You can delay Part B enrollment without penalty if you are covered by an employer plan based on your current employment. However, you should still enroll in Part A at 65 — it is free and has no penalty for early enrollment. When you leave your job, you have eight months to enroll in Part B without penalty.

What is the penalty for missing my enrollment window?

Your Part B premium increases by 10 percent for each full year you delayed past your initial enrollment window. This penalty is permanent and applies for as long as you have Medicare. Part D has a separate penalty of approximately 1 percent of the national average premium per month delayed.

Do I have to enroll in all four parts of Medicare at once?

No. Part A and Part B are separate from Part C and Part D. You can enroll in Part A and B during your standard window and add Part C or Part D later, though delaying Part D may result in a penalty if you do not have other creditable drug coverage.

What if I am a permanent resident, not a citizen?

Lawful permanent residents can enroll in Medicare at 65 if they have lived in the United States for at least five consecutive years. You will need to provide proof of your permanent resident status (green card) along with your other enrollment documents.