Is Medicare Part B Voluntary? 
In most cases , when someone turns 65 they are automatically enrolled in Medicare Part A and Part B . The exception is if someone is working full time , then they will need to enroll themselves . If you do n't want to keep the Part B coverage , you send back a card that is provided , stating that you want to drop it . If you keep that card , you keep the Part B coverage and pay the Part B premiums . 