Hospital Employment: Collections Minus Expenses?

I tried searching but couldn't find a relevant thread. I was wondering if anyone has experience with a hospital employed job that compensates in "collections minus expenses." How exactly does this work in a hospital setting? The hospital is still getting the facility fee for each clinic visit (hospital clinic)/procedure - so I'm not really clear on what "expenses" are typically attributed to the physician. Can anyone share their pay structure with this kind of system?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pain Medicine Source Type: forums