A copay is a fixed out-of-pocket amount paid by an insured for covered services. Insurance providers often charge co-pays for services such as doctor visits or prescription drugs.
Not all medical visits require copayments from patients.
Out-of-network visits might have higher copays than in-network medical providers.
Deductibles are much larger sums than copays.
Copays and coinsurance are not the same things. Coinsurance is a percentage of the bill, a copay is a fixed amount.
You can find more information at https://www.investopedia.com/terms/c/copay.asp