You can enroll in Medicare when you turn 65, regardless of your work history or income

Medicare may be able to access begins the month you turn 65. You do not need to have worked a certain number of years, earned a specific income, or retired from your job—age 65 is the threshold. If you were born on the first of the month, your coverage starts the month before. If you were born on any other day, coverage begins the month you turn 65.

You can enroll during a window that starts three months before your 65th birthday and closes three months after. For example, if you turn 65 in June, you can enroll starting in March and must enroll by September. Missing this window can delay your coverage and result in permanent penalties on your premiums, so marking your enrollment dates on a calendar matters.

Key Takeaways

  • Medicare enrollment opens three months before you turn 65 and closes three months after, giving you a seven-month window to sign up.
  • If you delay enrollment past your initial window without a valid reason, you will pay a permanent 10 percent penalty on Part B premiums for as long as you have Medicare.
  • You can enroll online through Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
  • If you are still working and covered by your employer's health plan at 65, you may be able to delay enrollment without penalty under certain conditions.

What happens if you enroll before or after your birthday month

Enrolling early—during the three months before your birthday—means your coverage will start the first day of the month you turn 65. Enrolling during the three months after your birthday delays your start date. If you enroll in the month after you turn 65, coverage begins the following month. If you enroll two months after, coverage starts two months later.

The longer you wait after your birthday, the longer the gap before coverage begins. During that gap, you remain responsible for any medical costs. This is why enrolling early in your window—as soon as the enrollment period opens—protects you from unexpected bills and ensures coverage starts as soon as possible.

Penalties for missing your enrollment window

If you do not enroll during your initial seven-month window and you do not have a valid reason for the delay, Medicare adds a permanent penalty to your Part B premium. The penalty is 10 percent of the standard Part B premium amount for each full year you were may be able to access but not enrolled. This penalty stays with you for life, even if you enroll later.

For example, if you turn 65 in 2024 and do not enroll until 2026, you owe two years of penalties. The standard Part B premium in 2024 is $164.90 per month; a two-year penalty would add roughly $33 per month to your premium permanently. The penalty amount changes each year because the base premium changes, but the percentage stays at 10 percent per year of delay.

When you can delay enrollment without penalty

You can postpone enrollment past your initial window without penalty if you are covered by a group health plan through your current employer or your spouse's current employer. This is called creditable coverage. You must be actively working or your spouse must be actively working for the coverage to count.

If you have creditable coverage, you have an eight-month window to enroll after your employment ends or your coverage stops, whichever comes first. During this window, you will not face penalties. You will need documentation from your employer showing the dates of your coverage and that you were actively employed. Keep this paperwork—you may need to show it when you enroll.

How to enroll when you turn 65

You have three main routes to enroll. The fastest is online through Medicare.gov. You will need your Social Security number, date of birth, and citizenship or immigration status. The process takes about 10 minutes, and you receive confirmation when ready.

You can also call 1-800-MEDICARE (1-800-633-4227). Representatives are available Monday through Friday, 8 a.m. to 8 p.m. Eastern time, and Saturday 9 a.m. to 1 p.m. Eastern time. Have your Social Security number and birth date ready. The call typically takes 15 to 20 minutes.

A third option is to visit your local Social Security office in person. You will need to bring your Social Security card, proof of citizenship or legal residency (passport, birth certificate, or naturalization papers), and proof of residence (utility bill or lease). Offices are open Monday through Friday, 9 a.m. to 4 p.m., though hours vary by location. Call ahead to confirm hours and current wait times.

Medicare Part A versus Part B enrollment timing

Part A (hospital insurance) is automatic for most people. If you are receiving Social Security benefits before 65, you are enrolled in Part A automatically three months before your 65th birthday. If you are not yet receiving Social Security, you must enroll in Part A during your initial window to avoid penalties.

Part B (medical insurance) requires active enrollment. This is where the 10 percent penalty applies if you miss your window. Part D (prescription drug coverage) also has its own enrollment rules and penalties. When you enroll through Medicare.gov or by phone, you can enroll in all parts at once, which simplifies the process.

Special situations that extend your enrollment window

If you are a federal employee, you may have different enrollment rules under the Federal Employees Health Benefits Program (FEHB). If you are a veteran, you may be covered under VA benefits and have different options. If you are still working past 65 and your employer has fewer than 20 employees, Medicare becomes your primary payer even if you are still employed.

If you miss your initial window and believe you have a valid reason—such as a language barrier, serious illness, or incorrect information from a government representative—you can request a Special Enrollment Period (SEP). This requires submitting documentation to Medicare explaining your situation. The process is not automatic, and approval depends on the reason you provide. Contact Medicare at 1-800-MEDICARE to discuss whether your situation qualifies.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65?

No, you cannot enroll before age 65 unless you have been receiving Social Security Disability Insurance (SSDI) for 24 months or have end-stage renal disease or ALS. For standard enrollment, the window opens three months before your 65th birthday.

What if I turn 65 but am still working full-time?

You can still enroll in Medicare at 65 even if you are working. If your employer offers health coverage and you are actively employed, you may delay Part B enrollment without penalty. Part A has no penalty for delay. Discuss your situation with your employer's benefits office to understand how Medicare and your employer plan coordinate.

Do I lose my current health insurance when I turn 65?

Not automatically. If you have employer coverage, it continues unless you or your employer end it. Many people keep employer coverage and Medicare together, with Medicare as secondary payer. Your employer's benefits office can explain how your specific plan works with Medicare.

What happens if I enroll late but have a good reason?

You can request a Special Enrollment Period if you missed your window due to circumstances beyond your control, such as incorrect information from a government office or a serious medical condition. You must provide documentation. Contact Medicare at 1-800-MEDICARE to ask whether your situation qualifies and to submit your request.

Can my spouse enroll at a different time than I do?

Yes. Each person has their own enrollment window based on their own birthday. Your spouse's window opens and closes based on when they turn 65, independent of your enrollment. You can enroll at different times without affecting each other's coverage or penalties.