Do these things really have purposeful list prices? I had to go to the hospital for an allergic reaction on a visit to the USA. They let me go with $600 in cas

Do these things really have purposeful list prices? I had to go to the hospital for an allergic reaction on a visit to the USA. They let me go with $600 in cash. When I asked for an itemized receipt, it has thousands in charges but nobody there really seemed to care if I paid that. The insurance company was welcome to pay if it wanted to though.