You must sign up for Medicare during your enrollment period, or you may pay a penalty for as long as you have Medicare

Most people become may be able to access for Medicare at age 65. The government gives you a window of time to sign up without penalty — this is called your Initial Enrollment Period, and it lasts seven months. It starts three months before the month you turn 65 and ends three months after. If you miss this window, you will owe a permanent increase to your premiums, even if you sign up years later.

The exact timing depends on your birthday. If you turn 65 in June, your enrollment period runs from March through September. You do not have to wait until the month you turn 65 to sign up — you can start in the three months before. Many people sign up as soon as they are may be able to access, which gives the government time to process the paperwork before coverage starts.

There are a few situations where the rules are different. If you are still working and covered by your employer's health plan, you may be able to delay Medicare without penalty. If you are not a U.S. citizen but are a permanent resident, your enrollment period may start later. These exceptions exist, but they require you to take action — the government will not automatically know your situation.

Key Takeaways

  • Your Initial Enrollment Period is seven months long: three months before you turn 65, the month you turn 65, and three months after.
  • If you sign up late without a valid reason, you will pay a permanent penalty on top of your regular premiums for the rest of your life.
  • You can sign up before the month you turn 65, so you do not have to wait until your birthday.
  • If you are still working and have employer coverage, you may be able to delay without penalty, but you must tell Medicare about your coverage.
  • You can sign up online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

What happens if you miss your enrollment period

If you do not sign up during your Initial Enrollment Period and you do not have a valid reason for the delay, Medicare will charge you a late enrollment penalty. This penalty is a percentage added to your Part B premium (the part that covers doctor visits and outpatient care). The penalty is 10 percent for each full year you were may be able to access but not signed up. If you were may be able to access for three years and did not sign up, your Part B premium will be 30 percent higher than the standard amount.

This penalty stays with you permanently. Even if you sign up five years later, you will still pay the higher amount every month for the rest of your life. The only way to avoid this penalty is to sign up during your enrollment period or to have a valid reason for signing up late — and you have to prove that reason to Medicare.

The same penalty applies to Part D (prescription drug coverage) if you go without it. If you do not sign up for Part D when you first become may be able to access and you do not have other prescription coverage, you will pay a penalty when you finally do sign up. The penalty is about 1 percent of the national average Part D premium for each month you were without coverage.

Valid reasons to sign up late without penalty

Medicare recognizes certain situations where you can sign up after your Initial Enrollment Period without paying a penalty. The most common reason is employer coverage. If you are still working at age 65 and your employer offers health insurance, you can delay Medicare Part B without penalty. Your employer must have at least 20 employees for this rule to explore. When you finally leave that job or lose the coverage, you have eight months to sign up for Medicare without penalty.

Another valid reason is if you are a federal employee with the Federal Employees Health Benefits Program (FEHB). You can delay Medicare Part B while you are covered by FEHB, and you have a grace period after coverage ends.

If you are not a U.S. citizen, your enrollment period may start later than age 65. You must have been a permanent resident for at least five years before your enrollment period begins.

To use any of these exceptions, you must be able to prove them to Medicare. Keep records of your employer coverage, your employment dates, and any letters from your employer confirming the health plan details. When you sign up late, you will need to show this documentation.

How to sign up during your enrollment period

You have three ways to sign up for Medicare: online, by phone, or in person. The fastest method is usually online at Medicare.gov. You can create an account, fill out the form, and submit it without leaving home. The website will tell you what documents you need before you start — usually your Social Security number, date of birth, and citizenship information.

You can also call 1-800-MEDICARE (1-800-633-4227) to sign up by phone. A representative will walk you through the questions and submit the form for you. This call is free and available 24 hours a day, seven days a week. Have your Social Security card and proof of citizenship nearby when you call.

If you prefer to sign up in person, visit your local Social Security office. You can find the nearest office at ssa.gov or by calling 1-800-772-1213. Bring your Social Security card, proof of citizenship (such as a birth certificate or passport), and proof of residency (such as a utility bill or lease). The office will submit your Medicare process for you.

No matter which method you choose, sign up early in your enrollment period. This gives the government time to process your paperwork and get your coverage started on time. If you sign up in the last month of your enrollment period, there may not be enough time to process everything before your coverage should begin.

When your coverage starts after you sign up

The date your Medicare coverage begins depends on when you sign up. If you sign up during the three months before the month you turn 65, your coverage will start on the first day of the month you turn 65. If you sign up during the month you turn 65, your coverage starts on the first day of the following month. If you sign up during the three months after you turn 65, your coverage starts on the first day of the month after you sign up.

For example, if you turn 65 on June 15 and sign up in April, your coverage starts June 1. If you sign up in June, your coverage starts July 1. If you sign up in August, your coverage starts September 1.

Once you sign up, you will receive a Medicare card in the mail. It usually arrives within two weeks, but allow up to four weeks. You do not need the physical card to start using your benefits — your coverage begins on the date Medicare tells you, even if the card has not arrived yet. If you need to see a doctor before the card arrives, you can give them your Medicare number, which will be in the letter Medicare sends you.

Questions to ask your doctor or Medicare

Before your coverage starts, contact your current doctor to ask whether they accept Medicare. Not all doctors do, and you want to know this before you need care. Ask whether they are accepting new Medicare patients and whether they participate in Original Medicare, Medicare Advantage, or both.

If you are signing up for a Medicare Advantage plan (Part C) instead of Original Medicare, ask your doctor which plans they participate in. Different Advantage plans have different networks of doctors, and your doctor may be in some networks but not others.

Call Medicare at 1-800-MEDICARE if you have questions about your enrollment period, your coverage start date, or whether you may have access to for a late enrollment exception. Representatives can tell you exactly when your enrollment period ends and what documents you need to sign up.

When to seek help from a counselor

If you are unsure whether you need to sign up now or whether you can delay because of employer coverage, contact your State Health Insurance information Program (SHIP). SHIP offers free, one-on-one counseling about Medicare. A counselor can review your specific situation and tell you whether delaying is safe for you. You can find your state's SHIP at shiptalk.org or by calling 1-877-839-2675.

You should also reach out to SHIP if you missed your enrollment period and are not sure whether you have a valid reason to sign up late without penalty. A counselor can help you gather the documents Medicare will need to review your case.

Frequently Asked Questions

Can I sign up for Medicare before I turn 65?

Yes. Your enrollment period starts three months before the month you turn 65, so you can sign up as early as then. Many people sign up three or four months before their birthday to make sure everything is processed in time. You cannot sign up more than three months early.

What if I am still working at 65 — do I have to sign up for Medicare?

If your employer has 20 or more employees and offers health insurance, you can delay Part B without penalty. You must still sign up for Part A (hospital insurance) at 65 unless you are a federal employee. When you leave your job or lose coverage, you have eight months to sign up for Part B without penalty. Contact your employer's benefits office to confirm your plan has at least 20 employees.

What is the penalty for signing up late?

For Part B, the penalty is 10 percent of the standard premium for each full year you were may be able to access but not signed up. This amount is added to your premium permanently. For Part D (prescription drugs), the penalty is about 1 percent of the national average Part D premium for each month you were without coverage. Both penalties stay with you for life.

Do I have to sign up for all parts of Medicare at the same time?

No. Part A (hospital insurance) and Part B (medical insurance) are separate. You can sign up for Part A and delay Part B if you have employer coverage. Part D (prescription drugs) is also separate. However, delaying any part without a valid reason will result in a penalty when you finally sign up.

What if I miss the important date by a few days?

Missing the important date by even one day means you have missed your Initial Enrollment Period. You will need a valid reason to sign up late without penalty. Contact Medicare or SHIP right away to explain your situation and ask whether your reason qualifies. Do not assume a few days will be overlooked — the rules are strict.