Gastric Bypass Surgery Support Group
Gastric bypass (GBP) is any of a group of similar operative procedures used to treat morbid obesity, a condition which arises from severe accumulation of excess weight in the form of fatty tissue, and the health problems ("co-morbidities") which result. If you are considering gastric bypass or have had it, join the community where we share our experiences and find support.

I would ask the hospital for the explanation, just to make sure there are no over charges. Good luck.
I have spoken to the hospital, it is just items they use during the surgery, quoted $5,000 as that is the average, any items not used they will give me a refund.
Wishing you a great success!