Anyone have experience fighting charges on your hospital bill?

I just got my bill from the hospital for my birth. After the birth, I had some complications and my OB ordered an ultrasound. However, the US didn't show what my OB wanted to see so he ordered a 2nd one. In my opinion, I shouldn't have to pay for both of them since the first one was wrong. Do you think I have any chance at arguing my way out of the charges?