Has anyone dealt with Univera Insurance

I am just beginning this process and have an appt to meet with my doctor to hopefully see if he will recommend me for this surgery. I have a bmi of 37 and my father has a lot of cardiac issues. I haven't been on a medically supervised diet per se but have spent the last 15 years of yoyo diets and many attempts to lose weight that failed I am so ready to begin this, like now. I was wondering if anyone dealt with univera and if they have special requirements like a 6 mos diet plan. I don't want to wait. I want to begin now. I called them and they said there weren't any requirements to fulfil but just that my doc deem it medically necessary. Any input would be much appreciated and might help my anxiety