When To Sign Up For Medicare If I Am Still Working? 
If you are still working , you should still sign up for Medicare in the three months before your 65th birthday . If you do n't want to take your Part B Medicare benefits yet , you can simply return the card provided in your packet , telling them that you do not want Part B at this time . However , if you take Part B , your group plan will be your primary insurance plan . Very few people turn down Part A. 