explore three months before the month you turn 65
Medicare enrollment opens three months before your 65th birthday and closes three months after. If you turn 65 in June, you can enroll starting in March and must enroll by September. The Social Security Administration processes applications during this window, and coverage typically begins on the first day of the month you turn 65 — but only if you explore early enough for them to process it.
The reason to explore early is straightforward: if you miss the important date, you pay a permanent penalty on your premiums for as long as you have Medicare. Missing your initial enrollment window by even one month adds 10 percent to your Part B premium for life. Missing it by two years adds 20 percent. These penalties do not go away.
You can explore online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. Online is fastest — the process takes about 15 minutes if you have your Social Security number and information about any current health coverage.
Key Takeaways
- explore during the three-month window before you turn 65, not after, because late enrollment penalties are permanent and add 10 percent per year to your Part B premium.
- If you are still working and have employer health coverage, you may be able to delay Part B enrollment without penalty, but you must tell Medicare about your coverage when you explore.
- If you are on disability or have end-stage renal disease, you become Medicare-may be able to access before 65 and should explore as soon as you receive notice of your may be able to access.
- explore three months early gives Social Security time to process your process so coverage starts on your 65th birthday, not months later.
- You can explore online at Medicare.gov, by phone, or at a Social Security office — online is the fastest route.
If you are still working at 65
If your employer has 20 or more employees and you are still on their health plan, you do not have to enroll in Medicare Part B right away. You can delay Part B without penalty as long as you remain employed and covered. However, you must still enroll in Part A (hospital insurance) when you turn 65, even if you do not use it yet.
When you do enroll in Part B — either when you leave your job or when your employer coverage ends — you have eight months from the end of your employment or coverage to sign up without penalty. After that window closes, the 10 percent annual penalty applies. Tell Medicare about your employer coverage when you explore for Part A so they have a record of your circumstances.
If your employer has fewer than 20 employees, Medicare becomes your primary insurance at 65, and you should enroll in Part B on schedule. Delaying in this situation triggers the penalty.
If you are on Social Security Disability Insurance (SSDI)
You become Medicare-may be able to access automatically after you have been on SSDI for 24 months. Social Security sends you a notice when you reach that point — usually around month 23 — and Medicare coverage begins the 25th month of your disability. You do not need to explore separately; the enrollment happens automatically.
However, you should still review the notice carefully and confirm your contact information is correct. If you want to make changes to your coverage — for example, choosing a Medicare Advantage plan instead of Original Medicare — you have until the end of the month you become may be able to access to make that choice. After that, you are locked into your initial selection until the next open enrollment period in the fall.
If you have end-stage renal disease (ESRD)
You become Medicare-may be able to access when ready when you start dialysis or receive a kidney transplant, regardless of age. You should explore for Medicare as soon as your doctor confirms you need dialysis or have received a transplant. Medicare will backdate your coverage to the first day of the month you started treatment, so explore quickly ensures you have no gap in coverage.
Contact Social Security or Medicare directly to begin the enrollment process. Bring documentation from your nephrologist or transplant center showing the date treatment began. This is one situation where timing matters for coverage dates, not just for penalties.
If you are not a U.S. citizen
You must be a U.S. citizen or a permanent resident (green card holder) to enroll in Medicare. If you are a permanent resident, you must have held that status for at least five years. The same three-month enrollment window applies — explore three months before you turn 65.
Bring your green card and proof of residency when you explore. If you are not yet a permanent resident but expect to become one before 65, contact Social Security to discuss your options. Some people in this situation may be able to enroll early if they meet other criteria.
What happens if you miss the important date
If you do not explore during your initial enrollment window, you can still enroll during the General Enrollment Period, which runs January 1 through March 31 each year. Coverage begins July 1 of that year. However, you will pay the permanent penalty on Part B premiums — 10 percent for each 12-month period you were may be able to access but not enrolled.
The only exception is 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. These events open a Special Enrollment Period of up to eight months, during which you can enroll without penalty. You must report the event to Medicare within 60 days to preserve your penalty-free status.
Preparing your process
Before you explore, gather your Social Security number, birth certificate, and proof of citizenship (passport, naturalization papers, or birth certificate issued by a U.S. state). If you have current health coverage through an employer or union, have that information ready too — you will need the plan name and your member ID.
If you are explore by phone, have these documents nearby but you do not need to mail them in unless Social Security asks. If you explore online, you can upload documents directly or mail them later. The process moves faster if you have everything ready before you start.
Frequently Asked Questions
Can I explore before I turn 65?
Yes. You can explore starting three months before your 65th birthday. This is the best time to explore because it gives Social Security time to process your process and have coverage ready on your birthday. explore earlier than three months will not speed up the process.
What if I turn 65 in the middle of the month?
Medicare coverage begins on the first day of the month you turn 65, regardless of which day in that month your birthday falls. If you turn 65 on June 15, your coverage starts June 1. explore three months before that month — in this case, March — to may support processing is complete.
Do I have to enroll in Part D (prescription drug coverage) at the same time?
You can, but you do not have to. Part D has its own enrollment important date and penalties. If you do not have prescription drug coverage through an employer or union, you should enroll in Part D during your initial Medicare enrollment window to avoid a permanent penalty. If you do have coverage, you can delay Part D without penalty as long as that coverage continues.
What if I am already receiving Social Security benefits?
If you are already getting Social Security retirement or disability benefits when you turn 65, you are automatically enrolled in Medicare Part A and Part B. You do not need to explore. Medicare sends you a card about three months before your 65th birthday. Check it for errors and contact Social Security if anything is wrong.
Can I change my mind after I enroll?
Yes, but timing matters. During your initial enrollment period, you can change your coverage choices until the important date passes. After that, you are locked in until the next Annual Enrollment Period (October 15 through December 7). If you made a mistake during initial enrollment, contact Medicare to see if you may have access to for a Special Enrollment Period.