Is Medicare Part B Voluntary? 
Medicare Part B is indeed voluntary . But before you refuse it , consider this . If you change your mind at a point in the future you will be required to pay a late enrollment penalty . For each 12 month delay you pay a 10 % penalty . Outpatient charges can be significant if you do not have Medicare Part B. Most carriers will not issue a Medigap plan if you do not have Part A and B. 