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

Medicare enrollment opens on the first day of the month you turn 65, but you can start the process three months earlier. Most people sign up during this window without penalty. If you miss it and do not have other health coverage, you will pay a permanent surcharge on your premiums for as long as you have Medicare.

You do not have to wait until your birthday month. Starting three months before, you can contact Social Security, go online, or visit your local Social Security office. The enrollment period lasts seven months total — three months before, the month you turn 65, and three months after.

The sooner you enroll, the sooner your coverage begins. If you sign up in the month you turn 65, coverage typically starts the first of that month. If you sign up after your birthday month, there may be a delay.

Key Takeaways

  • You can begin the enrollment process three months before you turn 65, and you have until three months after to avoid a permanent premium penalty.
  • Social Security handles Medicare enrollment — you can sign up online at ssa.gov, by phone at 1-800-772-1213, or in person at your local office.
  • You will need your Social Security number, birth certificate, proof of citizenship or legal residency, and information about any current health coverage.
  • If you are still working and have employer health insurance, you may be able to delay Part B enrollment without penalty, but you must report this to Social Security.
  • Coverage typically begins the first of the month in which you turn 65, or the first of the following month if you enroll after your birthday month.

What documents and information you need before you start

Gather these items before you contact Social Security. Having them ready speeds up the process and reduces errors. You will need your Social Security number, date of birth, and citizenship or legal residency status.

Bring or have available a birth certificate or passport, proof of U.S. citizenship (naturalization papers, passport, or state-issued ID), and proof of residency (utility bill, lease, or mortgage statement dated within the last two months). If you were born outside the United States, you will also need your green card or visa.

Write down any current health insurance information — the name of your employer or plan, your policy number, and your coverage dates. If you have coverage through a spouse's job, note their employer name and whether they are still working. Social Security uses this to determine whether you can delay Part B without penalty.

Three ways to enroll: online, by phone, or in person

Online enrollment is the fastest route. Go to ssa.gov/benefits/retirement/medicare.html and create or log into your my Social Security account. You can complete the entire process in one sitting. You will answer questions about your work history, citizenship, and current coverage. After you submit, you receive a confirmation number when ready.

Phone enrollment takes about 15 minutes. Call Social Security at 1-800-772-1213. Have your documents nearby. A representative will walk you through the same questions as the online form. Ask them to confirm your coverage start date before you hang up. Request a confirmation number and write it down.

In-person enrollment at your local Social Security office works if you prefer to speak face-to-face or if you have complex circumstances — for example, if you are unsure whether you can delay Part B. Find your office at ssa.gov/locator. Call ahead to confirm hours and whether you need an appointment. Bring all your documents with you.

What happens if you are still working at 65

If you are still employed and have health insurance through your job, you do not have to enroll in Part B (medical insurance) right away. You can delay Part B without paying a penalty, but you must tell Social Security that you are still working and have employer coverage. This is called creditable coverage.

You must still enroll in Part A (hospital insurance) when you turn 65, even if you are working. Part A is free for most people. Part B is optional if you have employer coverage, but Part A is not.

When you leave your job or lose your employer coverage, you have eight months to enroll in Part B without penalty. The eight-month clock starts the month after your employment ends or your coverage ends, whichever comes first. If you miss this window, you will pay 10 percent more per year for every 12 months you were not enrolled.

Understanding the different parts of Medicare and what each covers

Part A covers hospital stays, skilled nursing facility care, hospice, and some home health services. There is no monthly premium for most people who paid Medicare taxes while working. You pay a deductible when you are admitted to the hospital.

Part B covers doctor visits, outpatient care, lab tests, and preventive services. It has a monthly premium (the amount changes each year) and a yearly deductible. You typically pay 20 percent of the cost after you meet the deductible.

Part D covers prescription drugs. It is optional but recommended. If you do not enroll when you first become may be able to access and you do not have other drug coverage, you will pay a penalty for every month you are not enrolled. The penalty is added to your Part D premium permanently.

Part C, also called Medicare Advantage, is an alternative to Parts A and B. It is offered by private insurance companies and includes drug coverage. If you choose Part C, you do not need Part D separately. You can enroll in Part C during your initial enrollment period or during the annual open enrollment period (October 15 to December 7).

Timeline: when coverage starts and what to expect after enrollment

If you enroll during your birth month or earlier, coverage usually begins on the first day of the month you turn 65. If you enroll after your birth month, coverage typically begins the first of the following month. Social Security will send you a confirmation letter with your coverage start date within two weeks.

Your Medicare card will arrive in the mail about two weeks before your coverage begins. It shows your name, Medicare number, and which parts you are enrolled in. Keep this card with you. You will show it to doctors and hospitals.

Before your coverage starts, contact your current doctors and ask whether they accept Medicare. Ask your pharmacy whether they accept your Part D plan if you enrolled in one. If your current doctor does not accept Medicare, you will need to find a new one.

Common mistakes that delay or complicate your enrollment

The most common mistake is missing the enrollment window entirely. If you turn 65 and do not enroll within seven months, you will owe a permanent penalty on Part B and Part D premiums. There is no way to remove this penalty later, even if you enroll years later. Mark your calendar three months before your 65th birthday.

Another frequent error is not reporting that you still have employer coverage. If you are working and have health insurance through your job, you must tell Social Security. If you do not, Social Security may enroll you in Part B anyway, and you will pay premiums you do not need. Call Social Security to correct this before your coverage begins.

Do not assume your doctor accepts Medicare. Some doctors have stopped accepting Medicare patients or have limited availability. Call your doctor's office before your coverage starts and confirm they accept Medicare. If they do not, ask for a referral to someone who does.

Do not skip Part A enrollment just because it is free. You still have to enroll. If you do not, you will not have hospital coverage and you may face penalties later.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

You can begin the enrollment process three months before your 65th birthday, but your coverage will not start until the month you turn 65 (or the following month if you enroll after your birthday month). You cannot have Medicare coverage before age 65 unless you have been receiving Social Security disability benefits for 24 months or have end-stage renal disease.

What if I miss the seven-month enrollment window?

If you do not enroll within seven months of your 65th birthday and you do not have other may have access to coverage, you will pay a permanent surcharge on your Part B and Part D premiums for as long as you have Medicare. There is no way to remove this penalty. You can still enroll after the window closes, but the penalty applies when ready.

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

No. You must enroll in Part A, but Part B and Part D are optional. If you have employer coverage, you can delay Part B and Part D without penalty. You can enroll in Part C instead of Parts A and B, but you cannot have both at the same time.

What if I am not a U.S. citizen?

You must be a U.S. citizen or have been a lawful permanent resident for at least five years to enroll in Medicare. If you are a lawful permanent resident, bring your green card and proof of residency. If you do not meet these requirements, you may not be may be able to access for Medicare.

How long does it take to get my Medicare card after I enroll?

Social Security typically mails your Medicare card within two weeks of enrollment. It arrives before your coverage begins. If you do not receive it within three weeks, call Social Security at 1-800-772-1213 to request a replacement.