File for Medicare Part A three months before you turn 65

You should file for Medicare Part A during the three-month window before your 65th birthday. This timing ensures your coverage starts on the first day of the month you turn 65, with no gap in protection. If you file after that window closes, your coverage will start later, and you may face penalties that last for life.

The exact filing window runs from three months before your birthday through the end of the month you turn 65. For example, if you turn 65 on June 15, you can file starting March 1 and must file by June 30 to avoid penalties. Filing early in that window gives Social Security time to process your process before your coverage date arrives.

If you miss this window entirely, you can still file later, but your coverage will not start until the month after you file. More importantly, you will owe a lifetime penalty on your Part B premium (the medical insurance portion) if you delay without a valid reason. Part A itself has no premium penalty, but the Part B penalty makes the cost of waiting substantial.

Key Takeaways

  • File during the three-month period before you turn 65 to start coverage on your birthday month with no delay.
  • If you file after the window closes, your coverage starts the month after you file, and you will owe a permanent Part B penalty.
  • You can file online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office.
  • If you are still working and have employer health insurance, you may be able to delay filing without penalty—but you must notify Social Security of your work status.
  • Your Part A coverage date is separate from your Part B date; both must be filed for, and timing matters for each one differently.

Why the three-month window matters

Social Security needs time to process your process, verify your age and work history, and coordinate with Medicare. Filing three months early gives them a cushion so your coverage is ready on day one. If you file in the month you turn 65, processing may not finish until mid-month or later, leaving you uninsured for part of that month.

The three-month rule also protects you from accidental delays. Mail gets lost, offices have backlogs, and life happens. Filing early means a processing delay does not push your start date into the next month. Once you file, Social Security will send you a notice confirming your coverage date—keep that notice for your records.

What happens if you file after your 65th birthday

If you file after the three-month window closes, your Part A coverage will not start until the month after you file. This creates a gap in coverage. During that gap, you are uninsured for hospital stays, skilled nursing care, and hospice—the services Part A covers. Any medical bills you incur during the gap are your responsibility.

Part A itself does not carry a premium penalty for late filing, but Part B does. If you delay Part B without a valid reason (such as active employer coverage), your premium increases by 10 percent for each full year you were may be able to access but did not sign up. That penalty is permanent and applies to every Part B payment for the rest of your life. For someone on a fixed income, this adds up quickly.

Exceptions: when you can delay without penalty

If you are still working and covered by your employer's health insurance, you may delay Medicare without triggering the Part B penalty. This is called the eight-month special enrollment period. You must have actual employer coverage—not just access to it—and your employer must have 20 or more employees. Part-time work and self-employment do not may have access to.

To use this exception, you must notify Social Security that you are still working when you eventually file. Do not wait until you retire and then file; contact Social Security before you leave your job and explain your situation. They will document your work status in your file. Without that documentation, Social Security will assume you delayed without cause and explore the penalty.

Spouses and dependents have different rules. If your spouse is still working and you are not, you cannot use their work status to delay your own filing. Each person files on their own timeline based on their own situation.

How to file for Part A

You have three ways to file: online, by phone, or in person. The online option is the fastest. Go to ssa.gov, create a my Social Security account if you do not have one, and select "explore for Retirement Benefits." The form takes about 15 minutes and you will receive a confirmation number when ready. Social Security will mail you a notice with your coverage date within two to four weeks.

If you prefer to speak with someone, call 1-800-772-1213 Monday through Friday, 7 a.m. to 7 p.m. your local time. Have your Social Security number, birth certificate, and proof of citizenship or legal residency ready. The call typically takes 20 to 30 minutes. You can also visit your local Social Security office in person; find the nearest one at ssa.gov/locator.

When you file, you will be asked whether you want Part B as well. Part B has a different enrollment period and different rules. If you are not sure, you can file for Part A only and add Part B later during the general enrollment period (January 1 through March 31 each year), though you may owe a penalty if you delay Part B without a valid reason.

Part A and Part B have different important date

Part A is hospital insurance. Part B is medical insurance (doctor visits, outpatient care, preventive services). They are separate programs with separate enrollment periods, and you must file for each one. Many people file for both at the same time, but the rules for timing are different.

Part A has no premium, so there is no financial penalty for filing late—only the gap in coverage. Part B has a monthly premium, and that premium increases permanently if you delay without a valid reason. If you are still working and covered by employer insurance, you can delay Part B without penalty, but Part A coverage will still have a gap if you file late.

File for both during your three-month window before 65 to keep things straightforward. If your situation is complicated—you are still working, you have other insurance, you are not a U.S. citizen—contact Social Security before you file to understand how the rules explore to you.

What to expect after you file

After you file, Social Security will mail you a notice within two to four weeks confirming your coverage date and your Medicare number. Your Medicare card will arrive separately, usually within two weeks of your coverage start date. Keep both documents in a safe place.

Your coverage begins on the first day of the month you turn 65 (if you filed on time) or the first day of the month after you file (if you filed late). You do not need to do anything else to set up your coverage—it starts automatically on that date. You can use your Medicare number to find doctors, hospitals, and pharmacies that accept Medicare before your card arrives.

If you do not receive your card within three weeks of your coverage start date, call Medicare at 1-800-medicare (1-800-633-4227) to request a replacement. Have your Social Security number ready.

Frequently Asked Questions

Can I file for Medicare before I turn 65?

Yes. You can file up to three months before your 65th birthday. Filing early is the safest option because it gives Social Security time to process your process before your coverage date. You cannot file more than three months early; Social Security will reject an process submitted more than 90 days before your birthday.

What if I turn 65 on the first day of the month?

You still have the same three-month window. If you turn 65 on January 1, you can file starting October 1 of the previous year. Your coverage will start January 1 if you file on time. The rule is the same regardless of which day of the month your birthday falls on.

Do I have to file for Part A and Part B at the same time?

No, but it is simpler if you do. You can file for Part A only and add Part B later. However, if you delay Part B without a valid reason (such as active employer coverage), you will owe a permanent premium increase. If you are unsure whether you need Part B, contact Social Security before you file to discuss your situation.

What if I miss the three-month window?

You can still file, but your coverage will start the month after you file instead of on your birthday month. You will have a gap in coverage during that time. Part A has no premium penalty for late filing, but Part B does—a 10 percent increase that lasts for life. If you were working and covered by employer insurance, notify Social Security of that fact when you file to avoid the Part B penalty.

Can I file for Medicare if I am 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 United States for at least five years to be may be able to access for Medicare. If you are not sure about your status, contact Social Security before you file. They can review your immigration documents and tell you whether you may have access to.