What Is Irmaa For Medicare Part D? 
IRMAA stands for Income Related Monthly Adjustment Amount and is the extra premium that persons with higher income must pay for Medicare Part B and drug coverage . IRMAA Medicare Part D uses the income on the 2011 tax return in determining whether higher premiums should be charged . The extra premiums range from $ 11.60 to $ 66.60 / mo in 2013 , for incomes over $ 85,000 . 