You don't always have to explore — Social Security handles it for most people
If you're already receiving Social Security retirement benefits when you turn 65, Medicare enrollment happens automatically. Social Security sends your information to Medicare, and your coverage begins on the first day of the month you turn 65. You'll receive your Medicare card in the mail about two weeks before that date. No process needed.
The same is true if you're on Social Security Disability Insurance (SSDI). After you've been receiving SSDI for 24 months, Medicare starts automatically, regardless of your age. Again, no action required on your part.
However, if you're not yet receiving Social Security when you turn 65, or if you're self-employed and haven't filed for benefits, you do need to take a step. The window to enroll without penalty is specific, and missing it can cost you money for the rest of your life.
Key Takeaways
- If you're receiving Social Security retirement benefits at 65, Medicare enrolls you automatically with no process needed.
- If you're on SSDI for 24 months, Medicare starts automatically regardless of your age.
- If you're not on Social Security at 65, you must enroll in Medicare yourself during your Initial Enrollment Period, which runs from three months before to three months after your 65th birthday.
- Missing your enrollment window can result in permanent late-enrollment penalties added to your Part B and Part D premiums.
- You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.
When you must explore yourself
You need to explore for Medicare if you reach 65 and are not receiving Social Security benefits. This includes people who are still working, self-employed individuals, and those who haven't yet filed for retirement benefits. Even if you plan to keep working past 65, you still need to enroll in Medicare during your Initial Enrollment Period.
Your Initial Enrollment Period is a seven-month window: it starts three months before the month you turn 65 and ends three months after. For example, if you turn 65 in June, your enrollment period runs from March through September. You can enroll anytime during this window without penalty, but waiting until the last month is risky — processing delays can happen.
If you miss this window, you can still enroll later, but you'll face a permanent penalty. Part B premiums increase by 10 percent for each full year you delayed enrollment. Part D (prescription drug coverage) penalties work the same way. These penalties stay with you for life, even if you eventually enroll.
how the process works if you're not automatically enrolled
The easiest method is online at Medicare.gov. Go to the "Sign Up for Medicare" section, create or log into your Medicare account, and follow the enrollment steps. The process takes about 10 minutes and you can do it from home.
You can also call 1-800-MEDICARE (1-800-633-4227) to enroll by phone. Representatives are available seven days a week, and they can answer questions about which parts of Medicare you need. Have your Social Security number and information about your current health coverage ready.
A third option is to visit your local Social Security office in person. You'll need to bring your Social Security card, proof of citizenship or legal residency, and proof of age (birth certificate or passport). Staff can enroll you on the spot, though wait times vary by location.
What happens if you're still working at 65
Working past 65 doesn't exempt you from Medicare enrollment. You still need to enroll during your Initial Enrollment Period, even if you have health insurance through your employer. However, there's an exception: if your employer has 20 or more employees and you're covered under their group health plan, you can delay Part B enrollment without penalty.
This exception is called the Special Enrollment Period. It lets you enroll in Part B after you leave that job or lose the employer coverage, without the 10 percent penalty. You have eight months from the date you lose coverage or stop working to enroll. You must report this situation to Medicare when you do enroll so they can waive the penalty.
Part A (hospital insurance) has no penalty for delayed enrollment, so some people skip it if they have employer coverage. However, enrolling in Part A is usually free at 65, and it's worth having as backup coverage. Part D (prescription drugs) still carries a penalty if you delay, even while working.
Situations where you get extra time to enroll
Medicare recognizes that some people have legitimate reasons for missing their Initial Enrollment Period. If you fall into one of these categories, you may have a Special Enrollment Period that extends your important date.
You get extra time if you lose health insurance coverage through an employer, union, or COBRA. You also get extra time if you're a U.S. citizen living abroad and return to the United States. Religious objectors to insurance can request a Special Enrollment Period as well. In each case, you have a specific window — usually eight months from the triggering event — to enroll without penalty.
If you believe you may have access to for a Special Enrollment Period, contact Medicare at 1-800-MEDICARE to discuss your situation. Have documentation of the event that triggered your delay (job loss letter, coverage termination notice, or proof of return to the U.S.). Medicare staff can review your case and determine whether you're may be able to access to enroll penalty-free.
What you need to know about Part A and Part B
Part A covers hospital stays, skilled nursing facility care, hospice, and home health services. It's usually free at 65 if you or your spouse paid Medicare taxes while working. Most people don't need to do anything to enroll in Part A — it starts automatically when you turn 65, whether or not you explore for Social Security.
Part B covers doctor visits, outpatient care, and medical equipment. It has a monthly premium (the standard amount in 2024 is $164.90, but it varies by income). Part B is optional, but if you don't enroll when you're first may be able to access, you'll pay a penalty every month for the rest of your life. The penalty is 10 percent of the Part B premium for each full year you delayed.
When you enroll, you choose whether to take Part B right away or delay it. If you have employer coverage and may have access to for the Special Enrollment Period exception, you can delay Part B. Otherwise, enroll during your Initial Enrollment Period to avoid the penalty.
Frequently Asked Questions
What if I'm not a U.S. citizen?
You must be a U.S. citizen or a lawful permanent resident (green card holder) who has lived in the U.S. for at least five consecutive years to enroll in Medicare. If you're a permanent resident, bring your green card and proof of residency when you explore. Undocumented immigrants are not may be able to access for Medicare.
Can I enroll in Medicare before I turn 65?
Your enrollment period starts three months before you turn 65, so yes — you can enroll early. Enrolling early is actually a good idea because it gives Medicare time to process your process and mail your card before your coverage begins on the first day of the month you turn 65.
Do I lose my Medicare if I move to another state?
No. Medicare coverage is the same nationwide. Your card and benefits follow you if you move. If you change addresses, update your information with Medicare at Medicare.gov or by calling 1-800-MEDICARE so they have your correct mailing address.
What if I turned 65 years ago and never enrolled?
You can still enroll, but you'll owe back premiums and penalties. Contact Medicare at 1-800-MEDICARE to discuss your situation. They can calculate what you owe and set up a payment plan. The sooner you enroll, the sooner your coverage begins and the less penalty accumulates.
Is there a penalty for enrolling late in Part A?
Part A has no late-enrollment penalty. If you didn't enroll when you turned 65, you can enroll later without owing extra money. However, your coverage won't be retroactive — it begins the month you enroll. It's still worth enrolling as soon as possible so you have coverage in place.