[saratogaman]

Caution: Like many healthcare facilities, they may do "balance billing" -- after accepting payment from medicare and/or health insurance, they try to have you pay all of the rest. As a participating provider (with Blue Cross, for example), they are allowed only to then have you pay your co-pay. "Participating provider" means that they have agreed to accept the insurance payment as payment in full (except for the co-pay).
They tried to BS me into paying $2,200 for an outpatient procedure after they accepted the Blue Cross payment and my co-pay. My insurance company told me how to challenge it and I ended up not paying a penny more.
I guess they count on a certain number of people just writing a check, rather than challenge them.
It's our money!