En español | Medicare Part D plans set their own premiums, drug prices and per-prescription costs. These costs will vary from plan to plan. Your Part D costs will depend on the plan that you choose. What you pay for Medicare Part D coverage could be higher based on your income. For example, single persons with an income greater than $85,000 and married couples with an income greater than $170,000 will pay higher monthly premiums. If you have a limited income and resources, you may qualify for Extra Help to pay for some of your Part D costs.