Co-pay  /ˈkōˌpā/ Noun 

A contribution made by an insured person toward the cost of medical treatment or other services: US “plans with low premiums are more likely to have high co-pays”.

https://www.dictionary.com/browse/copay

A co-pay (or copay or co-payment) is a set fee that you pay when you go to your doctor or fill a prescription. For example, if you go to your doctor because of a sinus infection, the amount you pay for that visit is your copay.

Also, if you go to the pharmacy for a refill of a needed medicine, the amount you pay for that prescription is your copay.

Your co-pay is usually printed right on your health plan ID card. Co-pays cover your portion of the cost of a doctor’s visit, urgent care visit or medication.

Do I always have a co-pay?

Not all plans have co-pays, but most plans have co-pays for doctor visits, prescriptions and urgent care visits.

Is the co-pay all I owe for a visit?

Yes and no… It depends on your plan whether you owe anything else (co-insurance) after your co-pay.  For instance, you may owe 20% of the additional office visit cost if you have an 80/20 plan, but you may also only owe the co-pay.