This is the dollar amount you pay for health care expenses. In most plans, you pay this after you meet your deductible limit. For example, you pay a set dollar amount to your doctor for an office visit. So, if your copay is $25, you pay that amount when you go to your doctor. Copays are also used for some hospital outpatient care services in the Original Medicare plan. In prescription drug plans, it is the amount you pay for covered drugs.