Medicare requirements, and gastric sleeve

I'm new to this website, and have been surfing the internet for answers. First I'm 5'6", and weigh 270, with sleep apnea, and asthma. I've had knee arthroscopic surgery on both knees due to weight. My primary referred me to a bariatric surgeon that accepts Medicare, and he has sent the surgeon a letter of medical necessity for the surgery. I've read conflicting information with regards to the 6 months of medically supervised weight program. Can amyone answer if Medicare still requires this? I have my appointment with the surgeon next month, and I'm hoping I qualify for surgery. Any information would be so helpful! Thank you!