You can sign up for Medicare starting three months before the month you turn 65

Medicare enrollment opens during a window called your Initial Enrollment Period, which runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after. If you sign up during this window, your coverage starts on the first day of the month you turn 65 (or the first day of the following month if you sign up in your birth month or later).

If you miss this window, you can still sign up, but you may pay a permanent penalty on your premiums for as long as you have Medicare. The penalty is 10 percent per year for each 12-month period you were may be able to access but did not sign up. There is one exception: if you or your spouse worked and had health insurance through that job, you may have extra time to sign up without penalty.

The sooner you sign up, the sooner your coverage begins and the lower your lifetime costs. Most people should start the process about three months before their 65th birthday.

Key Takeaways

  • Your Initial Enrollment Period is seven months long: three months before you turn 65, your birth month, and three months after.
  • You can sign up online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
  • If you miss your Initial Enrollment Period, you will pay a permanent penalty unless you had employer health insurance during that time.
  • You will need your Social Security number, proof of citizenship or legal residency, and information about any current health coverage.
  • Coverage can start as early as the first day of the month you turn 65, depending on when you sign up.

Three ways to sign up for Medicare

Online at Medicare.gov is the fastest route for most people. Go to Medicare.gov, select "Sign up for Medicare," and follow the steps. You will create an account, enter your personal information, and choose your coverage. You can complete the entire process in one sitting and get confirmation right away. This method works if you are comfortable using a computer or tablet.

By phone at 1-800-MEDICARE (1-800-633-4227) is available 24 hours a day, seven days a week. A representative will walk you through your options, answer questions about costs, and help you choose plans. This is a good choice if you want to talk through your options or if you have questions about which plan fits your situation. The call is free.

In person at your local Social Security office lets you sign up face-to-face. Find your nearest office at ssa.gov/locator. You can bring documents with you and get help on the spot. This works well if you prefer to handle things in person or if you need help with language access.

What documents and information you will need

Before you start, gather these items: your Social Security number, proof of U.S. citizenship or legal residency (a birth certificate, passport, or naturalization papers), and your current health insurance information if you have it. If you are still working or your spouse is still working, bring details about that employer health insurance plan.

You will also need to know your income if you want to find out whether you may have access to for help paying premiums or out-of-pocket costs. This is not required to sign up, but it can save you money. Have your most recent tax return or pay stub handy.

If you are signing up online, you can upload documents or enter information directly. If you are calling or going in person, a representative can tell you exactly what they need to see.

The difference between signing up early and signing up late

If you sign up during your Initial Enrollment Period (three months before through three months after your 65th birthday), your coverage starts on the first of your birth month or the first of the following month, depending on when you submit your process. There is no penalty, and you avoid a gap in coverage.

If you sign up after your Initial Enrollment Period ends, you enter what is called General Enrollment, which runs from January 1 to March 31 each year. Coverage would not start until July 1 of that year. You will also owe a permanent 10 percent premium penalty for each full 12-month period you were may be able to access but did not sign up. This penalty stays with you for life, even if you switch plans later.

The only way to avoid this penalty after your Initial Enrollment Period is if you had health insurance through an employer (yours or your spouse's) during the time you were may be able to access. If that applies to you, you have eight months after that employment or coverage ends to sign up without penalty.

What happens after you sign up

After you submit your process, Medicare will send you a confirmation letter within two weeks. This letter will tell you your coverage start date and your Medicare number. Keep this letter in a safe place — you will need your Medicare number for doctor visits and prescriptions.

About two weeks before your coverage starts, you will receive your Medicare card in the mail. If you signed up online or by phone, you can also view your card and print a temporary version from your Medicare.gov account right away.

Your coverage begins on the date listed in your confirmation letter. From that day forward, you can use your Medicare benefits at any doctor, hospital, or pharmacy that accepts Medicare. If you chose a Medicare Advantage plan (Part C), your plan card will arrive separately and may have a different start date — check your confirmation letter for details.

Special situations: working past 65 or having employer coverage

If you are still working and your employer offers health insurance, you may not need to sign up for Medicare right away. You can delay signing up without penalty as long as you have employer coverage through your job or your spouse's job. When you or your spouse stops working or loses that coverage, you have eight months to sign up for Medicare without paying a penalty.

If you are self-employed or own a business, you do not have employer coverage, so the normal enrollment rules explore. Sign up during your Initial Enrollment Period to avoid penalties.

If you are receiving Social Security benefits already, you will be signed up for Medicare automatically three months before the month you turn 65. You do not need to do anything — your Medicare card will arrive in the mail. If you are not receiving Social Security, you must sign up yourself.

Frequently Asked Questions

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

Your Initial Enrollment Period still runs for seven months: three months before your birth month, your birth month, and three months after. If you sign up during your birth month or later, your coverage typically starts on the first day of the following month rather than the first day of your birth month. Check your confirmation letter for your exact start date.

Can I change my mind after I sign up?

Yes. You have until the end of the calendar year to make changes to your coverage during your Initial Enrollment Period. After that, you can make changes during the Annual Enrollment Period, which runs October 15 to December 7 each year. Changes made during Annual Enrollment take effect January 1 of the following year.

Do I have to sign up for all parts of Medicare at once?

No. You can sign up for Part A (hospital insurance) and Part B (medical insurance) separately from Part D (prescription drug coverage). However, if you do not sign up for Part D when you first become may be able to access, you may pay a penalty later. Talk to a Medicare representative about your situation.

What if I do not have a Social Security number?

You can still sign up for Medicare if you are a legal resident of the United States. You will need to provide proof of legal residency instead. Call 1-800-MEDICARE to walk through the process with a representative who can help you with the documents you need.

Is there a fee to sign up for Medicare?

No. Signing up for Medicare is free. However, once your coverage begins, you will pay premiums for Part B and Part D (if you choose it), and you will have deductibles and copayments when you use services. These costs vary depending on which plan you choose.