What Is Co Payment In Medicare? 
A co-payment is the portion of the bill you are responsible for . Under original Medicare you are responsible for 20 % of the Medicare Approved amount . You will receive an explanation of benefits from Medicare outlining what the charges were , what was approved , what they paid and what you are responsible for . Your doctor can not balance bill you the difference . Some states allow 15 % over the Medicare approved amount in excess charges . 