Q: Do I need to sign up for Medicare at 65 if I’m still working?
A: Medicare eligibility begins at age 65, and signing up on time can help you avoid premium surcharges. But if you’re working at 65, you do not necessarily need to sign up for Medicare Part B.
Medicare eligibility starts at age 65. Your initial window to enroll is the seven-month period that begins three months before the month of your 65th birthday and ends three months after it. Seniors are generally advised to sign up on time to avoid penalties that could prove quite costly over the course of retirement.
Specifically, if you fail to sign up for Medicare on time, you’ll risk a 10 percent surcharge on your Medicare Part B premiums for each year-long period you go without coverage upon being eligible. (Since Medicare Part A is usually free, a late enrollment penalty doesn’t apply for most people.) If you’re still working at age 65, however, a different set of rules applies.
If you are still working at age 65 and have "credible medical coverage", you may be able to wait to sign up until your group coverage ends.
You should consult with Social Security to make sure you have "credible medical coverage" if your spouse or you have group coverage past 65.
You should also call Social Security to enroll in Medicare Part A ONLY if you are keeping your employer coverage beyond the age of 65.