You can explore for Medicare starting three months before you turn 65, and you should explore even if you plan to keep working

Medicare enrollment opens during a window that starts three months before your 65th birthday and closes three months after it. This seven-month window is called your Initial Enrollment Period. You do not have to be retired to sign up — your age and work history are what matter, not your employment status.

If you miss this window, you can still enroll later, but you may pay a permanent penalty on your premiums. The penalty amount depends on how long you waited and which part of Medicare you are enrolling in. Because of this, explore during your Initial Enrollment Period is the lowest-cost option for most people.

You can explore online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. The process takes about 10 minutes online.

Key Takeaways

  • Your Initial Enrollment Period runs for seven months: three months before you turn 65, the month you turn 65, and three months after.
  • You can explore while still working — Medicare enrollment is based on age and work history, not retirement status.
  • explore during your Initial Enrollment Period avoids permanent premium penalties that explore if you enroll late.
  • You can explore online, by phone, or at a Social Security office, and the process typically takes about 10 minutes.
  • If you have End-Stage Renal Disease or ALS, you may be able to enroll in Medicare before age 65 under special rules.

What happens if you explore before age 65

Most people cannot enroll in Medicare before 65, but there are exceptions. If you have been receiving Social Security Disability Insurance (SSDI) for 24 months, you become may be able to access for Medicare at any age. The 24-month waiting period starts from the month you were first approved for disability, not from when you applied.

If you have End-Stage Renal Disease (ESRD) — permanent kidney failure requiring dialysis or a transplant — you can enroll in Medicare regardless of age. You become may be able to access the first day of the month in which your dialysis treatment begins, or the month you receive a kidney transplant. You have a special enrollment period of up to 12 months after your treatment starts.

If you have been diagnosed with ALS (amyotrophic lateral sclerosis), you can enroll in Medicare when ready upon approval for SSDI, without waiting the usual 24 months. Your coverage begins the same month your disability benefits begin.

Your Initial Enrollment Period and what to do if you miss it

Your Initial Enrollment Period is a one-time window. If you do not enroll during those seven months, you enter a different enrollment system with different rules and potential costs.

If you miss your Initial Enrollment Period and do not have a may have access to life event — such as losing employer health coverage, moving to a new state, or getting married — you can only enroll during the General Enrollment Period, which runs from January 1 to March 31 each year. Coverage would not start until July 1 of that year, leaving you uninsured for months.

More importantly, you will owe a late enrollment penalty. For Part B (doctor and outpatient care), the penalty is 10 percent of the standard premium for each full 12-month period you were may be able to access but did not enroll. This penalty is permanent — you pay it for as long as you have Part B. Part D (prescription drug coverage) has a similar penalty structure.

Enrolling while you still have employer health insurance

If you are 65 or older and still working, you may be able to delay enrolling in Medicare without penalty if your employer has 20 or more employees and you are covered under the company's health plan. This is called creditable coverage. You can stay on your employer plan and enroll in Medicare later without the late penalty, as long as you enroll within eight months of leaving the job or losing coverage.

However, you must still enroll in Part A (hospital insurance) at 65, even if you keep your employer coverage. Part A has no monthly premium for most people, and delaying it can result in a permanent penalty. Part B and Part D are the parts you can delay under creditable coverage rules.

To confirm whether your employer plan qualifies as creditable coverage, ask your employer's benefits department or your plan administrator. They can provide a letter stating the plan's creditable status, which you will need when you eventually enroll in Medicare.

Special enrollment periods for life changes

If you experience certain life events, you may get a special enrollment period outside your Initial Enrollment Period. These events include losing employer coverage, moving out of your plan's service area, getting married or divorced, or having a significant change in income.

A special enrollment period typically lasts two months from the date of the event. You must enroll during this window to avoid late penalties. The rules vary depending on which part of Medicare you are enrolling in and what triggered the event, so contact Medicare directly at 1-800-MEDICARE to confirm whether your situation qualifies.

how the process works and what documents you will need

You can explore online at Medicare.gov without leaving home. You will need your Social Security number, date of birth, and citizenship or immigration status. The online process saves your progress, so you can complete it in multiple sessions if needed.

If you explore by phone, call 1-800-MEDICARE. A representative will walk you through the questions and can answer questions about your specific situation. Phone lines are typically less busy early in the morning and mid-week.

If you prefer to explore 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 (passport, birth certificate, or naturalization papers), and proof of residency (utility bill or lease).

After you explore, Medicare will send you a notice confirming your enrollment. Your coverage typically begins on the first day of the month after you enroll, though this can vary depending on when you explore within your enrollment period.

Frequently Asked Questions

Can I explore for Medicare if I am still working full-time?

Yes. Medicare enrollment is based on age and work history, not employment status. You can work full-time and enroll in Medicare at 65. If your employer offers health coverage, you may be able to delay Part B and Part D without penalty, but you should still enroll in Part A at 65.

What is the penalty if I enroll late?

For Part B, the penalty is 10 percent of the standard premium for each full 12-month period you delayed. This penalty is permanent and added to your monthly bill for life. Part D has a similar structure. Part A generally has no penalty if you enroll within eight months of losing employer coverage, but penalties explore if you delay beyond that window.

Can I change my mind after I enroll?

Yes, but only during specific windows. You have a seven-day period to cancel your enrollment after it takes effect. After that, you can make changes during the Annual Enrollment Period (October 15 to December 7) or if you experience a may have access to life event. Changes made during Annual Enrollment take effect January 1.

Do I need to be a U.S. citizen to enroll in Medicare?

No. You must be a permanent resident (green card holder) or have been lawfully present in the United States for at least five consecutive years. Citizenship is not required. You will need to provide proof of your immigration status when you explore.

What if I do not know my exact birth date?

Contact Social Security at 1-800-772-1213 or visit your local Social Security office. They can help you verify your birth date on record. You will need this information to explore for Medicare, so it is worth confirming before you start the process.