An article in Medical Economics explains it all.
“Every day, hospitals and health systems are buying independent doctors and turning them into employed physicians. When they do, hospitals tack a facility fee onto the doctor’s fee every time he or she performs a procedure. These fees add zero value, yet the law allows hospitals to charge them to “cover overhead.”
These money-for-nothing fees are one reason hospitals can afford to pay doctors more than doctors can earn on their own, and lure them out of independent practice—a trend that is unhealthy for doctors and for Americans.”