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On average, Part D premiums are rising by $1 in 2015, to $32 per month. But that average is for all plans. Some of the most popular plans are boosting premiums by more than that, s ays Ross Blair, senior vice-president of eHealthMedicare.com, which includes tools to help people compare policies.
Those premiums are currently $104.90 per month for Part B and $31.17 per month for Part D. When the Part B program began, in 1966, the basic premium was intended to cover 50 percent of Part B costs per enrollee over age 65, with the rest of those costs funded by general revenues.