Medicare pays what percentage?

Medicare typically pays 80% of covered medical expenses, with the remaining 20% being the responsibility of the patient. This option is correct because it is the standard percentage that Medicare usually pays. The other options are incorrect as option A is too low, option B is commonly used for co-insurance with private insurance, and option D is too high as no insurance pays 100% without co-pays or deductibles. While percentages can vary based on individual plans and circumstances, the most common and widely accepted percentage for Medicare coverage is 80%.