billing statements

I am wandering if anyone had expienced an enormous bill after treatment at Cancer Treament Center of America. I was told they would accept what the insurance would pay. Then I found out the hospital was out of network, not the Drs. We had BC/BS We first went to MD and our insurance covered everything. But CTCA did not tell the whole truth. They did FINALLY write one bill off now I am wondering if they will with the 169.000 bill. People should check this out before going. And I loved  CTCA