You do not automatically get Medicare at 65 — you have to sign up

Turning 65 does not put you on Medicare by itself. You must take action to enroll. If you wait past your important date without a valid reason, you will pay a permanent penalty on your premiums for as long as you have Medicare, even if you sign up years later.

The enrollment window is seven months long: it starts three months before the month you turn 65 and ends three months after. If your birthday is in June, your window runs from March through September. You can enroll online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

The one exception: if you are still working and covered by your employer's health plan, you may be able to delay enrollment without penalty. But you still need to understand the rules, because the wrong move can cost you.

Key Takeaways

  • Your enrollment window is seven months: three months before, the month of, and three months after your 65th birthday.
  • Missing your important date triggers a permanent penalty on Part B and Part D premiums unless you have employer coverage or another valid reason to delay.
  • If you are still working and covered by your employer's plan, you can delay Part B enrollment without penalty, but you must enroll in Part A at 65 unless you are still actively employed.
  • Social Security will not automatically sign you up for Medicare even if you are already receiving benefits.
  • You can enroll online at Medicare.gov, by phone, or at your local Social Security office during your seven-month window.

How the enrollment window works and what happens if you miss it

Your seven-month window is fixed by your birth month, not by when you actually turn 65. If you were born on June 15, your window opens on March 1 and closes on September 30 — the calendar months, not 30 days from your birthday. Mark this on your calendar three months before your birthday, because this is the earliest you can enroll.

If you do not enroll during those seven months and you do not have a valid reason to delay, Medicare will charge you a permanent late enrollment penalty. For Part B (doctor and outpatient care), the penalty is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. That penalty stays on your bill for life. Part D (prescription drug coverage) has a similar penalty: 1 percent of the national average premium for each month you were late, rounded to the nearest dollar, and it also lasts as long as you have Part D.

The only reasons Medicare accepts for delaying without penalty are: you are still working and covered by your employer's health plan, you are covered by your spouse's employer plan, you are a federal employee with federal employee health benefits, or you are a veteran with VA coverage. If any of these explore, you can delay Part B and Part D enrollment, but you still need to enroll in Part A (hospital insurance) at 65 unless you are still actively employed.

What "actively employed" means and why it matters

If you are still working at 65, you can delay Part A enrollment only if you are actively employed — meaning you work for the employer whose plan covers you. If you have retired from your job but your former employer still covers you as a retiree, that does not count as active employment. You must enroll in Part A at 65.

The reason this matters: Part A is hospital insurance, and it is free at 65 if you have paid Medicare taxes for at least 10 years. If you do not enroll when you are first may be able to access and you do not have a valid reason to delay, you will pay a penalty when you finally sign up. The penalty is 10 percent of the Part A premium for each year you were may be able to access but not enrolled.

If you are unsure whether your situation counts as active employment, call Medicare at 1-800-MEDICARE before your birthday. They can tell you whether you can safely delay or whether you need to enroll in Part A now.

Social Security does not automatically enroll you, even if you are already receiving benefits

Many people assume that if they are already getting Social Security retirement benefits, Medicare will start automatically at 65. It will not. Social Security and Medicare are separate programs, and you must enroll in Medicare yourself.

If you are receiving Social Security, you will get a notice in the mail about three months before your 65th birthday. The notice explains your options and tells you how to enroll. Read it carefully — it is not an enrollment form, just information. You still have to take the next step yourself by going to Medicare.gov, calling, or visiting Social Security in person.

If you do not receive a notice, contact Social Security at 1-800-772-1213 to confirm your address is correct. Do not wait for a second notice — your seven-month window is fixed by your birthday, not by when you receive mail.

What to do if you miss your important date

If you realize you missed your seven-month window, you have limited options. You can enroll during the General Enrollment Period, which runs January 1 through March 31 each year. Coverage would start July 1 of that year. However, you will owe the permanent late enrollment penalty on Part B and Part D unless you can prove you had a valid reason to delay.

Valid reasons include: you were covered by an employer plan or your spouse's employer plan and did not know you had to enroll separately, you were not a U.S. citizen or permanent resident during your initial window, or you received incorrect information from Medicare or Social Security. If any of these explore, you can ask Medicare to remove the penalty. You will need to provide documentation — for example, a letter from your employer confirming you were covered.

Contact Medicare at 1-800-MEDICARE to discuss your situation. They can tell you whether you may have access to for penalty removal and what documents to submit. Do not delay — the sooner you enroll, the sooner your coverage starts.

How to enroll during your seven-month window

You have three ways to enroll: online at Medicare.gov, by phone at 1-800-MEDICARE (1-800-633-4227), or in person at your local Social Security office. Online is usually fastest — you can complete the enrollment in about 10 minutes if you have your Social Security number and information about any current health coverage.

When you enroll, Medicare will ask whether you want Part A, Part B, Part D, and whether you want to join a Medicare Advantage plan (Part C) instead of Original Medicare. You do not have to decide everything at once, but you do need to make choices during your window. If you do not choose, you will be enrolled in Part A and Part B automatically, but you will not have prescription drug coverage unless you add Part D.

Keep a record of your enrollment confirmation. Medicare will send you a Medicare card in the mail — it usually arrives within two weeks, but allow up to four weeks. Your coverage starts on the first day of the month you turn 65, even if your card has not arrived yet.

What happens if you enroll late but have a valid reason

If you missed your seven-month window but you have a valid reason — such as employer coverage you did not know you had to report separately — you may may have access to for a Special Enrollment Period. This gives you eight months from the date your employer coverage ends to enroll in Medicare without penalty.

To use a Special Enrollment Period, you must contact Medicare and provide proof of your employer coverage. Acceptable proof includes a letter from your employer, a copy of your health plan documents, or a pay stub showing the employer plan deduction. Medicare will review your situation and tell you whether you may have access to and when your penalty-free enrollment period begins.

Do not assume you may have access to — contact Medicare to ask. If you enroll without confirming you have a valid reason, you will owe the penalty even if you later prove you should have been allowed to delay.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

Yes, but only during your seven-month enrollment window, which starts three months before your 65th birthday. You cannot enroll earlier than that. Your coverage will start on the first day of the month you turn 65, regardless of when during the window you sign up.

What if I am still working and do not want Medicare yet?

You can delay Part B and Part D if you are covered by your employer's health plan and you are actively employed. However, you must still enroll in Part A at 65 unless you meet the active employment exception. Contact Medicare to confirm your situation qualifies before you skip enrollment.

Do I have to choose between Original Medicare and Medicare Advantage when I turn 65?

You must choose one or the other during your enrollment window. If you do not choose, Medicare will enroll you in Original Medicare (Part A and Part B) automatically. You can switch between Original Medicare and Medicare Advantage during the Annual Enrollment Period each October, but missing your initial window can trigger penalties.

What if I am not a U.S. citizen — can I get Medicare at 65?

You must be a U.S. citizen or permanent resident to enroll in Medicare. If you are not yet a permanent resident, you cannot enroll at 65. If you become a permanent resident later, you may may have access to for a Special Enrollment Period to enroll without penalty.

Can I enroll in Medicare online if I do not have a Social Security number?

You will need a Social Security number to enroll online or by phone. If you do not have one, you can enroll in person at your local Social Security office. Bring your birth certificate, passport, and proof of residency. Call 1-800-MEDICARE to find the office nearest you.