The Centers for Medicare & Medicaid Services has announced Medicare Part B premiums for 2020, and the base premium increases nearly 7% from $135.50 a month to $144.60 a month. That $9.10 monthly increase compares to a modest $1.50 monthly increase last year. Meanwhile high earners are still getting used to income-related surcharges that kicked into higher gear in 2018, and those have been bumped up again too.