Where to Sign Up for Medicare Online

You can sign up for Medicare through Medicare.gov, the official government website. Go to Medicare.gov/sign-up and you will see options based on your situation — whether you are turning 65, already on Social Security, or signing up late. The site walks you through each step and tells you what documents to have ready before you start.

You can also call 1-800-MEDICARE (1-800-633-4227) and a representative will help you sign up over the phone. This takes about 20 to 30 minutes. If you are deaf or hard of hearing, use the TTY number 1-877-486-2048. Many people choose the phone route because they can ask questions as they go, and the representative can spot missing information before you submit.

A third option is to visit a Social Security office in person. If you are already receiving Social Security benefits, you can often sign up for Medicare at the same time. You will need your Social Security card, proof of citizenship, and proof of residency (a utility bill or lease works). Walk-in hours vary by location, so call ahead.

Key Takeaways

  • Medicare.gov/sign-up is the official online portal, and you can complete the entire process there without calling or visiting an office.
  • You will need your Social Security number, proof of citizenship (birth certificate or passport), and proof of residency (utility bill, lease, or mortgage statement).
  • If you are already getting Social Security, Medicare will often start automatically three months before your 65th birthday — you do not have to sign up separately.
  • Signing up by phone (1-800-MEDICARE) takes about 20 to 30 minutes and lets you ask questions in real time.
  • If you miss the important date to sign up when you first turn 65, you can still sign up later, but you may face a permanent penalty on your premiums.

What Documents You Need Before You Start

Gather these documents before you begin the online process. You will need your Social Security number, which you should have memorized or written down. You will also need proof of citizenship — a birth certificate, passport, naturalization papers, or American Indian tribal document. If you do not have one of these, you can upload it later, but having it ready speeds things up.

You will need proof of residency showing your current address. A utility bill, lease agreement, mortgage statement, or property tax bill all work. The document should be dated within the last two months. If you recently moved, bring both your old and new address proof. You will also need your Medicare number if you already have one — this appears on any Medicare card you may have received.

If you are signing up for Part B (medical insurance) or Part D (prescription drug coverage), have your current insurance information ready. If you have coverage through an employer or union, bring the name of the plan and your member ID. If you are signing up late and want to avoid a penalty, you may need to show proof that you had other coverage during the time you were not on Medicare.

Step-by-Step: Signing Up on Medicare.gov

Start at Medicare.gov/sign-up. The site will ask you a few questions to figure out which path you need. It will ask whether you are turning 65 soon, already 65, or signing up late. It will ask whether you are a U.S. citizen or permanent resident. Answer honestly — the site uses these answers to show you the right forms and important date.

Next, you will create or log into your Medicare.gov account. You will need an email address and a password. If you already have a Medicare.gov account from checking your benefits or looking at your statements, use that same login. If not, the site will walk you through creating one — it takes about five minutes.

Once you are logged in, you will fill out the Medicare enrollment form. The form asks for your name, date of birth, Social Security number, citizenship status, and current address. It will ask which parts of Medicare you want — Part A (hospital insurance) usually starts automatically at 65, but you choose whether to take Part B (medical) and Part D (drugs). If you are still working and have employer coverage, you may want to delay Part B to avoid a penalty.

After you submit the form, the site will show you a confirmation number. Write this down or take a screenshot. Medicare will send you an email confirmation and a paper confirmation in the mail. The whole process takes about 15 to 20 minutes if you have your documents ready.

When Your Coverage Starts

Your coverage start date depends on when you sign up. If you sign up in the three months before your 65th birthday, your coverage usually starts on the first day of the month you turn 65. If you sign up during your birthday month, coverage starts the first of the following month. If you sign up after your birthday month, there is a delay — coverage may not start until several months later.

If you are already receiving Social Security, Medicare often starts automatically without you having to sign up. You will receive your Medicare card in the mail about two weeks before your coverage begins. If you do not receive it by the time your coverage should start, call 1-800-MEDICARE to check the status.

If you are signing up for Part B or Part D after your initial enrollment period, your coverage start date depends on when you sign up. Part B coverage usually starts the first of the month after you sign up. Part D has different rules — if you sign up during the annual enrollment period (October 15 to December 7 each year), coverage starts January 1. If you sign up outside that window, there may be a gap before coverage begins.

What Happens After You Sign Up Online

After you submit your enrollment, Medicare will review your information. This usually takes a few days to a week. You will get an email and a paper letter confirming what you signed up for. The letter will include your Medicare number — a unique identifier you will use for all Medicare business. Write this number down and keep it somewhere safe.

Your Medicare card will arrive in the mail. It shows your name, Medicare number, and which parts of Medicare you have (Part A, Part B, Part D, or a combination). You do not need to do anything with the card when it arrives — just keep it in a safe place. If you lose it, you can order a replacement through Medicare.gov or by calling 1-800-MEDICARE.

If you signed up for Part B or Part D, you will also receive information about premiums and how to pay. Part B has a monthly premium that is usually deducted from your Social Security check if you are receiving benefits. Part D premiums vary by plan. If you did not choose a Part D plan during enrollment, you can still choose one during the annual enrollment period without penalty.

If You Miss the Online important date

If you do not sign up for Medicare during your initial enrollment period (the three months before your 65th birthday, your birthday month, and the three months after), you can still sign up later. However, you may face a late enrollment penalty — an increase to your Part B or Part D premiums that lasts for as long as you have Medicare.

The penalty is 10 percent of the standard Part B premium for each full 12 months you were may be able to access but not signed up. For Part D, the penalty is 1 percent of the national average Part D premium for each month you were not covered. These penalties add up quickly, so signing up as soon as you realize you missed the important date is important.

You can still sign up online at Medicare.gov even if you are past your initial enrollment period. The site will show you the penalty amount before you confirm. You can also call 1-800-MEDICARE to sign up by phone. If you have a good reason for missing the important date — such as employer coverage that ended unexpectedly — you may be able to get the penalty waived. Bring documentation of your reason when you sign up.

Frequently Asked Questions

Can I sign up for Medicare online if I am not yet 65?

Yes, if you are getting Social Security Disability Insurance (SSDI) or have end-stage renal disease (ESRD), you can sign up online before 65. Go to Medicare.gov/sign-up and select the option for your situation. If you are still working and have employer coverage, you may want to delay Part B to avoid paying a premium while you still have group coverage.

What if I do not have a computer or internet access?

Call 1-800-MEDICARE and a representative will sign you up over the phone. You can also visit a Social Security office in person. Both options are free and do not require you to go online. The phone line is open Monday through Friday, 8 a.m. to 7 p.m. Eastern time.

Do I have to choose a Part D plan when I sign up online?

No. You can sign up for Part A and Part B without choosing a Part D plan. However, if you do not choose a plan during your initial enrollment period and you do not have other drug coverage, you may face a late enrollment penalty when you do choose one. You can pick a plan during the annual enrollment period (October 15 to December 7) without penalty.

How long does it take to get my Medicare card after signing up online?

Your card usually arrives in the mail within two to three weeks. You will get an email confirmation right away, and a paper confirmation letter within a few days. If your card does not arrive within a month, call 1-800-MEDICARE to check on it or order a replacement.

Can I change my mind after I sign up online?

Yes. You have until the end of the calendar year to make changes to your Part B, Part D, or Medicare Advantage coverage during the annual enrollment period. If you just signed up and want to change something right away, call 1-800-MEDICARE to see if they can make the change before your coverage starts.