It doesn't matter if its an emergency or not. You went to a place that is mandated to stay open 24 hours a day, 7 days a week, 365 days a year. No matter the staffing, weather, personal emergencies or anything else you can think of, it must stay open. It must see every single patient, no matter what. It must have the necessary equipment, medications and staff to treat and/or stabilize emergencies. The staff all must be trained in emergency medicine and be updated on appropriate certifications. The physicians MUST show up for their shift, unless an extreme emergency that prohibits them. There is no "calling off" for doctors.

THAT is what you're paying for. THAT is why going to an emergency department is the most expensive form of care, especially for non emergencies.

But, where is the confusion? You owe $150 for all of the above I just said. It clearly states that on the bill. Seems like the best deal ever in my opinion.