Medicare eligibility for seniors begins at age 65 (though some people qualify before that time because of a disability or other circumstance). Your initial enrollment period for Medicare begins three months before the month of your 65th birthday, and ends three months after the month you turn 65.
If you miss your initial Medicare enrollment window, you can sign up during the general enrollment period of January 1 through March 31 of each year. But holding off too long could cost you. If you wait too long to sign up for Medicare Part B, you’ll face a 10 percent increase in your Part B premiums for every year-long period you were eligible to enroll but didn’t. There are also financial implications associated with waiting too long to sign up for a Part D drug plan.
That said, if you’re still working and have coverage under a group health plan during the seven-month period surrounding your 65th birthday, you’ll get a special enrollment period that begins when you separate from your employer or your group coverage ends. As such, you won’t have to worry about the aforementioned penalties provided you sign up during your special enrollment period.