[{"magiAtMost":109000,"partBAdjustment":0,"partBTotalPremium":202.9,"partDAdjustment":0},{"magiOver":109000,"magiAtMost":137000,"partBAdjustment":81.2,"partBTotalPremium":284.1,"partDAdjustment":14.5},{"magiOver":137000,"magiAtMost":171000,"partBAdjustment":202.9,"partBTotalPremium":405.8,"partDAdjustment":37.5},{"magiOver":171000,"magiAtMost":205000,"partBAdjustment":324.6,"partBTotalPremium":527.5,"partDAdjustment":60.4},{"magiOver":205000,"magiLessThan":500000,"partBAdjustment":446.3,"partBTotalPremium":649.2,"partDAdjustment":83.3},{"magiAtLeast":500000,"partBAdjustment":487,"partBTotalPremium":689.9,"partDAdjustment":91}] USD/month by MAGI row (partBAdjustment, partBTotalPremium; partDAdjustment is added to the plan premium) (2026, from 2026-01-01) verified 2026-10-31 fresh https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles; next expected change 2027-01-01