It all depends on the specific insurance plan your employer has and the requirements of your surgeon. I have BCBS of IL. Some of the BCBS plans don't require the six month supervised diet and some do. Mine did, which thankfully I had already done. But due to the requirements my surgeon had (nutrition consults, psych eval, pulmonary eval, support meetings, etc) and the time it took to get in to see these people it was a very lengthy process. Not to mention the fact that they wouldn't even schedule the surgery until everything was completed, which meant waiting another month for the first available surgery date. It took me 6 months from the informational meeting until my surgery date. Granted, this is probably a bit longer than most, but just prepare for the worst and hope for the best.