Does BCBSIL have a place to check for approval/denial?
Here is the company's Web site: http://www.bcbsil.com/. You should be able to create a log in (if you have not already done so) so you can check on your account's activity (e.g. claim processing, authorization information, etc.). If the Web site does not provide you with all the information you need, then you probably will have to contact the customer service department or check in with the provider who submitted for authorization.
My best wishes to you in your pursuing the surgery.