Medical insurance can be confusing. When it comes to Medicare, there is no exception. You may have Medicare part A to cover you when you have to go to the hospital and part B to help pay for your doctor visits and such. If you need regular medications, you may have opted for part D, the prescription drug supplement. Things get even more confusing with part D. The amount you pay for your medications throughout the year will vary from a small co-pay to having to pay full price.