How Are Medicare Part B Premiums Determined? 
Very good question , and one that can not be answered . Each year Congress decides how much to charge for Medicare Part B premiums . The premiums are not based on the CPI -LRB- consumer price index -RRB- or any other measure of inflation . Premiums are not indexed to wages . Premiums are not tied to changes in your Social Security benefit . Premiums are what Congress decides to charge based on the political winds . 