I had a surgery couple months ago. Before surgery I talked to billing department about my insurance and she told me that I have to pay around $1,500 from my pocket, because my insurance would not over all expenses. And I did. But after that I received a statement from the hospital that I need to pay additional $800 because my insurance didnt pay them. In other words they overcharged the insurance and the insurance didnt pay all of them. As a result they are looking after me for the difference. How does it work and What should I do? Thank you