Trouble understanding doctors co payment?

I recently broke my foot, metatarsal on side of foot. I went to the ER and got x rays and was told it was broken. I made an appointment with a foot orthopedic doctor and took my ER x rays with me. Doctor looked at my foot for 2 minutes then left to look at x rays for 5 minutes. Came back and said I need to wear a walking boot/cast and come back in 4 weeks. A nurse then asked my shoe size and then gave me a size large plastic walking boot to put on.(nothing was custom fitted) I left and did not pay anything. I was billed for a broken metatarsal for $435 dollars and the walking boot for $300. Th

placeholder text for bug in Chrome