In 'old days' of 'traditional' US medicine, doc charges were single fee which was high enough to cover their overhead + prof service. Then this got split into prof fee + "facility" fee, and facility fee grew to be somewhat higher for entities distinct from doc's office itself (facility vs "non-facility" site for service-see link below). Health systems began buying up doc's private offices (in part) to profit from this, and now most US docs are employees (not in private practice).
For those interested in the technical details regarding Medicare physician fee schedules, inc role of "facility" fees, here's a link to get started:
It's enough to make even a seasoned bureaucrat's head spin. IMHO- This transition from simple single total fee to complex separate professional/facility/etc. fee structure has made it extremely difficult to compare actual overall pricing....and comparison pricing is critical to controlling costs in any business.