UHC approval question

I am confused about the UHC guidelines for approval. If my BMI is 49.9 and the minimum is 40. The contingency is a 6 month monitored diet plan. My question is can that "diet" be monitored before the process is started with the surgeon or can it be prior to that visit. I am concerned that I will have to wait 6 months. I have tried to lose weight for over a year and it seems counterproductive to make patients wait longer.  Does anyone have any experience with Insurance guidelines?

This is what I was told, if it is documented in your chart as a weight loss visit, and goals were discussed with PCP, it would count. Weight and BMI must be documented.   Your surgeon may require other things. 

I was told through UHC no 6 month diet needed with a BMI greater then 40+