sweet&spicy

hey guys so i have anthem blue cross blue shield va their requirement for weight loss surgery is a weight management program for 12 months i can get a call once a month from a health coach my question now i start loosing the weight im 3 months now into the program im afraid by the time i finish i will have a lower bmi and then they will deny me surgery ? can that happen? also what do you guys know about type of insurance i have does it cover all surgery? thanks