J.C.
Our dental covered anesthesia but it was done at a dental office. It is alway important to check with your insurance before so you know what they will cover. Also, it may simply have come back on you because of the amount. Our dental will cover a lot, but only up to $1750 a year, anything over that, no matter what it is, is not covered. They may have said yes, they would pay for the hospital, but it is up to you to know the amount of your benefit per year. My son just had 6 teeth pulled and a space maintainer put in, and even thought it was all stuff our insurance covered 100% we still paid almost $1500 out of pocket because they will cover 100%, until that $1750 is spent, and then cover nothing until the next year. and I don't know any dental plan that would have a benefit high enough to cover 9k. I know when my step dad had dental work done in a surgical suit he had to pay for the room out of pocket, but I don't know what kind of insurance (if any) he had at the time.
People keep talking about some preauthorization forms, but that is never a guarantee of coverage. If you look back at the billing they gave you before the procedure you will more then likely see a part on the form they had you sign before stating that they will bill insurance, but that any unpaid part is your responsibility. It sucks, but more then likely you have no real recourse. We have found out the hard way this year about how dental insurance works and how little they really cover if something major needs done.