Start Your process Three Months Before Your 65th Birthday

You can begin the process as early as three months before you turn 65. The Social Security Administration (SSA) handles Medicare enrollment, and they process applications faster when you explore in advance rather than waiting until your birthday month. If you miss the window before your birthday, you can still explore afterward, but you may face late enrollment penalties on some parts of Medicare.

The enrollment period that matters most is called your Initial Enrollment Period (IEP). It runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after. If you enroll during this window, your coverage typically starts on the first day of your birthday month. If you explore after this period ends, your coverage start date shifts later, and you may owe extra premiums permanently.

Key Takeaways

  • explore through Social Security (online at ssa.gov, by phone at 1-800-772-1213, or in person at your local office) starting three months before you turn 65.
  • You will need your birth certificate, proof of citizenship or legal residency, and your Social Security number; bring originals or certified copies if explore in person.
  • Medicare Part A (hospital insurance) is automatic if you have worked and paid Social Security taxes, but you must actively enroll in Part B (medical insurance) to avoid permanent penalties.
  • If you are still working and have health insurance through your employer, you may be able to delay Part B enrollment without penalty, but you must report this to Social Security.
  • Your coverage typically begins the first of the month you turn 65 if you enroll during your Initial Enrollment Period, but explore early gives Social Security time to process your request.

Three Ways To explore: Online, Phone, Or In Person

The fastest route is online at ssa.gov/benefits/retirement/medicare.html. You create a my Social Security account, answer questions about your work history and citizenship, and submit. The system confirms when ready whether you are may be able to access and shows you a summary of what you enrolled in. Processing typically takes one to two weeks online.

If you prefer to speak with someone, call Social Security at 1-800-772-1213. Representatives are available Monday through Friday, 7 a.m. to 7 p.m. your local time. Wait times are shortest early in the morning and on Tuesdays through Thursdays. Have your Social Security number, birth date, and citizenship information ready. The call takes 15 to 20 minutes, and the representative will confirm your enrollment before you hang up.

You can also walk into your local Social Security office with documents in hand. Find the nearest office at ssa.gov/locator. Bring your original birth certificate (or certified copy), proof of citizenship (passport, naturalization papers, or state ID), and your Social Security card. Bring originals or certified copies — photocopies are not accepted. Processing in person takes the same time as online or phone, but you leave with a receipt showing what you enrolled in.

Documents You Need Before You explore

Gather these documents before you start, whether you explore online, by phone, or in person. You will need your original birth certificate or a certified copy from the vital records office in the state where you were born. A photocopy does not work. If you were born outside the United States, bring your passport or naturalization papers showing you are a U.S. citizen or lawful permanent resident.

You will also need proof of your current address — a recent utility bill, lease, or mortgage statement works. If you have moved in the last few months, bring a document dated within the last 60 days. You do not need to bring your Social Security card itself, but you must know your number. If you do not know it, request a replacement card from Social Security before you explore for Medicare.

If you are explore in person, bring originals or certified copies. Online and phone applications do not require you to submit documents upfront, but Social Security may contact you later to verify information. If they do, you will have a important date (usually 10 days) to send copies by mail or upload them through your my Social Security account.

Understanding Part A, Part B, And When Each Starts

Part A (hospital insurance) covers inpatient hospital stays, skilled nursing facility care, hospice, and home health services. If you or your spouse worked and paid Medicare taxes for at least 10 years, Part A is automatic — you do not have to enroll. It starts on the first day of the month you turn 65. If you do not may have access to automatically, you can still enroll in Part A when you turn 65, but you will pay a monthly premium.

Part B (medical insurance) covers doctor visits, outpatient care, lab tests, and preventive services. Unlike Part A, Part B requires you to actively enroll. When you explore for Medicare, you will be asked whether you want Part B. If you say yes, it starts the first of your birthday month. If you say no or miss the enrollment window, you can enroll later, but you will owe a 10 percent premium increase for each 12-month period you were not enrolled.

There is one exception: if you are still working and covered by your employer's health plan, you can delay Part B enrollment without penalty. You must tell Social Security that you have group health coverage through work. Keep documentation of your employer coverage — you will need it later when you actually enroll in Part B. Once you leave your job or lose that coverage, you have eight months to enroll in Part B without penalty.

What Happens After You Enroll

Social Security sends you a Medicare card in the mail within two weeks of approval. The card shows your Medicare number, the date your coverage starts, and which parts you are enrolled in. Keep this card with you at doctor visits and hospital stays. If you do not receive it within three weeks, call 1-800-MEDICARE (1-800-633-4227) to check the status.

You will also receive a document called Your Medicare Coverage, which explains what is covered under each part and what you will pay out of pocket. Read the section on Part B premiums — your monthly premium amount is listed there. Part B premiums are deducted automatically from your Social Security check if you receive benefits, or you will receive a bill if you do not.

After your coverage starts, you can enroll in Part D (prescription drug coverage) and Medigap or Medicare Advantage (supplemental coverage). These have their own enrollment periods and important date. If you enroll in Part D within 63 days of your Part B start date, you avoid a permanent penalty. Many people wait to enroll in supplemental coverage until after they see what their out-of-pocket costs are under Original Medicare.

Common Mistakes That Cost You Money

The biggest mistake is not enrolling in Part B during your Initial Enrollment Period. If you turn 65 and do nothing, you are automatically enrolled in Part A but not Part B. If you enroll in Part B later — say, at 67 — you will pay a 20 percent higher premium for the rest of your life. That penalty does not go away. The only exception is if you had employer coverage and reported it to Social Security at the time you turned 65.

Another costly error is not reporting that you still have employer health coverage. If you are still working at 65 and covered by your company's plan, tell Social Security. If you do not, and you enroll in Part B anyway, you may end up paying for two insurance plans at once. When you eventually leave your job, you have eight months to enroll in Part B without penalty — but only if you reported your employer coverage upfront.

A third mistake is missing the important date for Part D enrollment. If you do not enroll in prescription drug coverage within 63 days of your Part B start date, you will owe a penalty every month you are enrolled in Part D later. Unlike Part B, this penalty does not expire — you pay it for as long as you have Part D coverage. If you do not take prescription drugs now, you can still enroll in Part D later without penalty, but the window closes once you turn 65 and enroll in Part B.

If You Miss Your Initial Enrollment Period

If you turn 65 and do not explore during your seven-month Initial Enrollment Period, you can still enroll, but your coverage will start later and you may owe higher premiums. The next opportunity is the General Enrollment Period (GEP), which runs January 1 through March 31 each year. If you enroll during GEP, your coverage starts July 1 of that year.

For example, if you turn 65 in September and do not explore until February of the following year, you have missed your IEP but are within GEP. You can enroll in February, and your coverage will start July 1. You will also owe a 10 percent Part B premium increase for each 12-month period you were not enrolled — in this case, about 10 months of penalty.

There are exceptions to the GEP rule. If you have a may have access to life event — such as losing employer coverage, moving out of your Medicare Advantage plan's service area, or becoming a U.S. citizen — you may be able to enroll outside the normal windows. Call 1-800-MEDICARE to report a may have access to event and ask whether you can enroll when ready.

Frequently Asked Questions

Do I have to enroll in Medicare at 65 if I am still working?

You do not have to enroll in Part B if you have health insurance through your current employer and are still working. However, you should still enroll in Part A (hospital insurance) because it is automatic and has no premium if you may have access to. Tell Social Security that you have employer coverage so you do not face a Part B penalty later.

What if I was born outside the United States?

You can enroll in Medicare if you are a U.S. citizen or lawful permanent resident (green card holder). Bring your passport or naturalization papers to prove citizenship, or your green card and I-94 arrival record to prove permanent residency. The enrollment process is the same as for U.S.-born citizens.

Can I change my mind after I enroll in Part B?

Yes, but only during certain windows. If you enroll in Part B and change your mind within 12 months, you can request to be disenrolled, but you will still owe premiums for the months you were enrolled. If you enrolled by mistake or did not understand what you were signing up for, call 1-800-MEDICARE and explain. They may be able to help, but there are no guarantees.

What if I do not have a birth certificate?

Contact the vital records office in the state where you were born and request a certified copy. This usually costs $10 to $25 and takes one to two weeks by mail. If you were born outside the United States, your passport serves the same purpose. If you have neither and cannot obtain them, call your local Social Security office to discuss other documents that might work.

When does my Medicare coverage actually start?

If you enroll during your Initial Enrollment Period (three months before through three months after your 65th birthday), your coverage starts on the first day of the month you turn 65. If you enroll after that period, your coverage starts the first of the month after Social Security processes your process, which is usually one to two weeks after you explore.