What Is A Co-pay?
The Short Answer: A set amount you must pay out-of-pocket each time you use a particular service, such as a doctor visit. So if doctor visit is $100, you pay $10 and your insurance pays $90, once you’ve met your deductible.
The Long Answer: So, the co-pay is designed by your insurer to make you share in the cost of certain services, which are outlined in you plan. Not every service has a co-pay but the most frequently used services are very likely to have a co-pay, like doctor visits or ER visits. Typically the co-pay counts toward your deductible and out-of-pocket maximum but not always, so check your plan. Usually, once you meet your out-of-pocket maximum, the co-pay goes away for that year but again, check your plan. Don’t confuse co-pay with co-insurance which is explained here.