I have BCBS NC and I am scheduled for surgery on 1/26. It depends on your plan but I didn't have a medically supervised diet or prerequisite other than my BMI level since I did not have any comorbidities. I actually was referred by my pcp. I received my surgery date at my first appointment back in October. I have to follow my weight management centers guidelines but that was it. You should be able to look up your specific plans requirements on the website. I am sorry for your loss.