Cigna and Lap Band

Does anyone have any information about lap band surgery and  coverage with Cigna? I meet most of the requirements for Cigna; Over 40 BMI, overweight for more than 5 years, 3 months medically supervised diet, dietician consultation. I’m in the process of getting proof of all my diets but some are hard to get proof for. (Using Alli etc.) So has any one had the lap band surgery with Cigna?  Are they very stringent about proof etc. throughout the whole process? Do they really drag their feet through the whole process or do they give release within a timely fashion?

Thank you for all your help in advance!

Sarah