That doesn't sound right to me. I had an emergency band removal last July (2013), and I have Premera insurance. They covered the surgery, and follow up visits with that surgeon / hospital.
My only thought would be that I had my band removal done through a hospital, and not an independent clinic. I am not fluent enough in health care rules to know if that would make any difference, but there are serious health risks when your band has slipped and it doesn't sound right that your insurance would not cover part of that surgery cost.
I has the sleeve surgery in January, and had to pay out-of-pocket to do so. The recovery time seemed longer (but maybe I forgot how long my band recovery process was the first time around), but I am very happy with that decision.
Wishing you the best...