Harvard Pilgrim Health ins question

Has anyone had their teen's gastric bypass covered by Harvard Pilgrim Health ins?  My daughter is 16 (will be 17) in June...She has met wth the surgeon, the nutritionist and the psychologist at Tufts in Boston.  We are not sure if our ins will cover her, she is definately morbidly obese, she is 5'7" and 265 lbs.....The ins co told me that they look at teens weight loss surgery on a case by case basis....