Went to a podiatrist for the first time.

Went to a podiatrist for the first time. He diagnosed heel spurs and PF. Prescribed Voltaren and orthotic inserts. I have some questions about orthotics. He said they are $350! Is that the average price? He didn't know if my insurance covers them so I would have to give him the money up front. I called my insurance company and they do cover orthotics. When I confirmed this with his office they said I still have to give them cash or ch