What is a Doughnut Hole? The  Medicare  Part D donut hole  is a temporary coverage gap in how much a  Medicare  prescription drug plan will pay for your prescription drug costs. Starting in  2020 ,  Medicare  Part D plan beneficiaries pay 25 percent of their brand name and generic drug costs while they're in the coverage gap. How does the donut hole work? The donut hole closed for all drugs in 2020, meaning that when you enter the coverage gap you will be responsible for 25% of the cost of your drugs. In the past, you were responsible for a higher percentage of the cost of your drugs. Although the donut hole has closed, you may still see a difference in cost between the initial coverage period and the donut hole. For example, if a drug’s total cost is $200 and you pay your plan’s $40 copay during the initial coverage period, you will be responsible for paying $25 (25% of $200) during the coverage gap. How do I get out of the ...