Is Enrollment In Medicare Part B Mandatory? 
No , enrollment in Part B Medicare is not mandatory . Some people put off enrolling in Medicare Part B until the next enrollment period -LRB- or more -RRB- after their 65th birthday because they are receiving good health insurance through the group plan offered at their place of employment . If you are enrolled in Part B Medicare automatically when you turn age 65 , you can turn it down . But do know the consequences of turning down Part B beforehand . 