Help!! Blue Cross Blue Shield. Blue Distinction Center

I am really freaking out tonight. I am supposed to have surgery Monday and the people at the hospital have screwed up my insurance somehow. I have Blue Cross Blue Shield federal (PPO) and am going to a Blue Distinction Center (Shasta Regional) for surgery. The lady tells me tonight that it could be $5000 out-of pocket. This can't be right. So far I have paid for my surgeon (total with deductible $438) and my inpatient copay ($300 for 3 days). I can't believe that my out-of pocket at a preferred provider would be $5000 for the OR. 
Does anyone have any feedback? I am about ready to cry. Of course, by the time I got this news it was too late to call the insurance company because they were closed. Something just doesn't seem right.

what he said and appeal it at the same time.

Paul,  I have printed this for my reference. Does this really work?  I know alot of people who go to the hospital where I am going for surgery stated they had to pay up front a so called deductible of almost $2000+. I will call my insurance company tomorrow AGAIN to get clarification one more time.  I do not have the funds up front should I have to pay out of pocket.  I can do a payment plan, but coming up with money before then is an issue right now. I have my PAT's this Thursday so I can let you know if they required or demanded me to pay anything.  I will do exactly as you stated in this post, but I fear I will come up against resistance. What should I do if I do?

I had my surgery last month. Because I had not met my deductible, my totl out-of -pocket ended up being $539. That included the surgery and the hospital stay. If I had met my deductible, my cost would only have been $239. I would definitely check. As in my case, mistakes can be made with billing.