Pulled this right of the TriCare Covered Services page......they won't approve the DS is biliopancreatic surgery (see below)
Gastric Bypass
TRICARE covers gastric bypass, gastric stapling and gastroplasty to include vertical banded gastroplasty and laparoscopic adjustable gastric banding (Lap-Band surgery) is covered only when the beneficiary meets one of the following conditions:
Is 100 pounds over ideal weight for height and bone structure and has one of these associated conditions: diabetes mellitus, hypertension, cholecystitis, narcolepsy, Pickwickian syndrome, hypothalamic disorders or severe arthritis of the weight-bearing joints
Is 200 percent or more over ideal weight for height and bone structure
Has had intestinal bypass or other surgery for obesity and because of complications, requires another surgery (takedown)
TRICARE does not cover:
Nonsurgical treatment of obesity, morbid obesity, dietary control or weight reduction
Biliopancreatic bypass, gastric bubble or balloon for the treatment of morbid obesity
Note for Active Duty Service Members: Bariatric surgery represents a major and permanent change in your digestive system that requires strict adherence to a specific dietary regimen that may interfere with operational deployment. A history of bariatric surgery is already a bar to military service and receiving bariatric surgery while on active duty may be grounds for separation. For more information, view the Health Affairs Policy 07-006.