Don't worry, you can try again and enroll from January 1 through March 31, After that your coverage will start on July 1.
And what about something called Special Enrollment Period?
Yeah, that falls in when you have medical insurance coverage under a group health plan. IN that case, you may not need to apply for Medicare part B at age 65, qualifying for SEP instead.
OK, so i understand than this can replace Medicare part B, isn't?