My last one was the anatomy scan at 20 weeks - the only other one I had was at 12 weeks. Insurance rarely covers more than that since they're not medically necessary without significant symptoms of complications that need further evaluation. High risk pregnancies get more but I'm awfully glad I didn't need them - it meant I had a healthy baby.
Its normally just two scans. 12 & 20 weeks unless theres complications.
My last one was at 36 weeks