Who Should Enroll In Medicare Part B? 
The only persons who may not want to enroll in Medicare Part B are those who have a group plan that has features better than Medicare Part B , and for which the group policy would be the primary payer . There is no penalty to wait until your group plan ends , to sign up for Part B Medicare . If you are an active duty service member and age 65 , you could also wait to sign up for Part B. For everyone else who qualifies , enrolling in Part B is reasonably priced and something you have paid into . Unless you have moral reasons against it , prefer private coverage , or are able to insure yourself , I know of no reasons to not enroll in it . 