How Much Do Most Dermatologists usually cost?

I know we all have different dermatologists and different insurance, but usually, how much do they cost?How Much Do Most Dermatologists usually cost?
My copay is $20 on a PPO to one of the top dermatologists in So Cal. When you call to make an appointment they will ask what insurance you have before setting a time and date.How Much Do Most Dermatologists usually cost?
When I went my co-pay was 40 dollars it also depends on the dermatologists, what you are getting done, and how much they can do.