If you need to go to the
hospital, voluntarily or otherwise, be sure that you, or whoever
is with you tells Admitting or Check-in that you do not want to
be seen by "out-of-network" physicians or staff.
I recently had a very expensive surprise of multiple doctor
bills from consultant physicians, who were not in my network. I
had no way of knowing until I started receiving bills. By then
it was too late to fight the charges. Adding insult to injury,
at least two of them came in and spoke to me (no medical service
provided), offering their services after discharge. I was billed
for a consultation - for them to sell their services to me.
Grrr!
Caveat Emptor.