Does BCBS of NC cover the gastric bypass revision?

i had the gastric bypass in 2008, I lost 120 pounds and did really good until about 3 years ago. I began gaining weight back no matter what I did to try to stop it. My knees began to bother me again so exercising became almost impossible. Two weeks ago I had knee surgery (June 17. 2016). My orthopedic doctor told me that my knee cap was in horrible shape and if I did not get the weight back off I would be looking at a knee replacement in the near future. Suggestions please!

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