From a New York Times online article:
For new patients, whose visits entail more work than those of established patients, facility fees typically range from $131 to $322 per visit; for established patients, they are slightly lower. In surgical centers and free-standing emergency rooms, the facility fee can be thousands of dollars.
A facility fee is an additional charge that some medical practices can add to the cost of each doctor visit. The additional charge usually comes as a surprise because, unlike an exam or a test or treatment, the facility fee is not tied directly to hands-on care.
The purpose of the facility fee is to compensate hospitals for the expense of maintaining the physical premises. Hospital-owned, off-campus medical practices are also allowed to charge the facility fee to cover specific regulatory requirements, such as building codes, disaster preparedness, equipment redundancy and other items that are largely invisible to patients.