Not always. If you’re already receiving Social Security or Railroad Retirement benefits, you’ll usually be enrolled in Medicare Parts A and B automatically. If not, you’ll need to sign up during your Initial Enrollment Period, which starts three months before you turn 65 and ends three months after your birthday month.
Most people apply three months before turning 65 to avoid late penalties or coverage gaps. Your Initial Enrollment Period lasts seven months total — three months before, your birthday month, and three months after.
Part A (Hospital Insurance): Usually free if you or your spouse paid Medicare taxes long enough.
You may face late enrollment penalties and delays in coverage. These penalties can last a lifetime, so enrolling on time is important unless you qualify for a Special Enrollment Period (like having employer coverage).