How to Sign Up for Medicare

You sign up for Medicare through one of three routes: online at Medicare.gov, by phone at 1-800-MEDICARE (1-800-633-4227), or in person at your local Social Security office. Which route you take depends on when you are turning 65 and whether you already receive Social Security. Most people become may be able to access at 65, but the signup window opens three months before your birthday month and closes three months after — a seven-month window. Missing this window can cost you in late penalties that last for life, so the important date matters.

The process itself is straightforward: you provide your name, date of birth, Social Security number, and citizenship or immigration status. You choose which parts of Medicare you want (Part A covers hospital care, Part B covers doctor visits and outpatient care). If you have employer coverage or are still working, you may not need to sign up right away — but you still need to understand the rules, because waiting past your important date without a good reason triggers permanent penalties.

Key Takeaways

  • Your signup window opens three months before your 65th birthday month and closes three months after — a seven-month period during which you should sign up to avoid late penalties.
  • You can sign up online at Medicare.gov, by phone at 1-800-MEDICARE, or at your local Social Security office; all three routes take about the same amount of time.
  • If you are already receiving Social Security, Medicare enrollment happens automatically when you turn 65, but you still need to choose your coverage parts.
  • If you have health coverage through your employer or a spouse's employer, you may be able to delay Part B signup without penalty, but you must document this coverage.
  • Late enrollment penalties are permanent — they add to your monthly premium for as long as you have Medicare — so missing your important date is costly even if you sign up later.

Signing Up Online at Medicare.gov

The online route is the fastest if you have your documents ready. Go to Medicare.gov, click "Sign up for Medicare," and follow the form. You will need your Social Security number, date of birth, citizenship information, and the names and addresses of your doctors and hospitals (though you can skip this if you do not have them yet). The form takes about 15 to 20 minutes to complete.

After you submit, Medicare sends a confirmation email and mails you a notice within two weeks. You do not receive your Medicare card when ready — it arrives by mail, usually within two to four weeks. If you need coverage to start on a specific date (such as the first of your birthday month), submit your form at least one month before that date to give the mail time to arrive.

Signing Up by Phone

Call 1-800-MEDICARE (1-800-633-4227) and tell the representative you want to sign up for Medicare. Have your Social Security number, date of birth, and citizenship information ready. The call takes 20 to 30 minutes. A representative will walk you through each question, which can be helpful if you are unsure about your answers or need to ask about your specific situation.

After the call, Medicare mails you a confirmation and your Medicare card within two to four weeks. Phone lines are busiest in the morning and on Mondays and Tuesdays, so calling on a Wednesday or Thursday afternoon usually means a shorter wait. If you reach a busy signal, the system will take your number and call you back the same day.

Signing Up In Person at Social Security

You can walk into your local Social Security office and sign up for Medicare there. Find your office at ssa.gov/locator. Bring your Social Security card, proof of citizenship (passport, birth certificate, or naturalization papers), and proof of residence (utility bill or lease). You do not need an appointment, but calling ahead to ask about wait times is wise.

The in-person route takes the longest — expect to spend 45 minutes to an hour at the office — but it is useful if you have questions about your specific situation or if you have had trouble with mail delivery. Your Medicare card arrives by mail within two to four weeks, the same as the other routes.

Automatic Enrollment If You Receive Social Security

If you are already receiving Social Security benefits when you turn 65, Medicare enrolls you automatically in Parts A and B. You do not have to do anything. Medicare mails your card about two weeks before your 65th birthday. You still have choices to make — such as whether to add Part D (prescription drug coverage) — but the basic enrollment is handled for you.

Even though enrollment is automatic, you should review the notice Medicare sends you to make sure the information is correct. If you do not want Part B for some reason (for example, because you have employer coverage), you must tell Medicare in writing within a specific timeframe, or you will be enrolled and charged a premium.

If You Have Employer Coverage or Are Still Working

If you or your spouse are still working and have health coverage through that job, you can delay signing up for Part B without penalty. This is called creditable coverage. You must sign up for Part A (hospital insurance) at 65, but Part B can wait until you or your spouse leave the job or lose the coverage.

When you do sign up for Part B later, bring proof that you had creditable coverage — usually a letter from your employer's benefits office or your health plan. Without this proof, Medicare will charge you a permanent penalty of 10 percent per year for each year you delayed. The penalty is added to your Part B premium for life, so documenting your coverage now saves you money later.

Understanding Late Enrollment Penalties

If you miss your seven-month signup window and do not have a good reason (such as creditable employer coverage), Medicare charges you a late enrollment penalty. For Part B, the penalty is 10 percent of the standard premium for each full year you were may be able to access but did not sign up. If the standard Part B premium is $165 per month and you waited two years, your penalty is 20 percent — an extra $33 per month, forever.

The same rule applies to Part D (prescription drug coverage). If you go 63 days or more without coverage and later sign up, you pay a permanent penalty. The only way to avoid these penalties is to sign up during your window or to have a documented reason for delay, such as employer coverage or a may have access to life event. Once the penalty is applied, you cannot remove it.

What Happens After You Sign Up

After you sign up, Medicare mails you a card with your Medicare number. Your coverage usually starts on the first day of your birthday month (or the first day of the month after you sign up, if you sign up after your birthday month has passed). You can start using your Medicare number right away to see doctors and fill prescriptions, even before your physical card arrives.

Within a few weeks, you will receive a notice in the mail explaining your coverage and any costs you owe. If you chose Part D (prescription drug coverage), you will also receive information about your drug plan. Review these notices carefully — they contain important details about your deductibles, copays, and which pharmacies and doctors are in your network.

Frequently Asked Questions

What if I turn 65 but am not ready to retire?

You still need to sign up for Part A (hospital insurance) at 65. You can delay Part B if you have employer coverage through your job or your spouse's job, but you must sign up for Part A to avoid penalties. Part A has no monthly premium if you or your spouse paid Medicare taxes for at least 10 years.

Can I sign up before my 65th birthday?

Yes. Your signup window opens three months before your birthday month. For example, if you turn 65 in June, you can sign up starting in March. Signing up early gives you time to receive your card and choose your coverage before your birthday.

What if I miss my important date?

You can still sign up after your important date, but you will owe a permanent late penalty on Part B and Part D unless you have proof of creditable coverage. The penalty is 10 percent per year for each year you delayed. Sign up as soon as you realize you missed the important date to stop the penalty from growing.

Do I have to choose a Medicare Advantage plan when I sign up?

No. When you sign up, you are enrolling in Original Medicare (Parts A and B). You can choose a Medicare Advantage plan later during the annual enrollment period (October 15 to December 7 each year). If you do not choose a plan, you stay in Original Medicare.

What if my information changes after I sign up?

Call 1-800-MEDICARE to update your address, phone number, or other details. You can also update your information online at Medicare.gov by logging into your account. Changes usually take effect within a few weeks.