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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.
1 The average monthly premium for a Medicare Part D Prescription Drug Plan in 2014 is $31, or $372 a year, according to the Department of Health and Human Services. 2  However, premiums can cost zero to more than $100 a month and not all plans are offered in all areas. The two basic expenses for Medicare Part D are the monthly premium and the cost of buying prescription medications under each plan. 2  The specific drugs covered vary from one plan to another, or even from year to year under the same plan, which means premium costs will vary depending on which drugs are covered.