I was just banded on 2/11 and I have bcbs AL. I did start the approval process in November and it took until the end of Jan to get approved, but the 6 month diet sheets were not a problem. My dates were not 30 days apart. We tried to keep them around the same dates every month but it wasn't an issue. I do know that they will ask for 6 CONSECTUTIVE months though. Your doctor should be kind enough to let you "record" your weight and just sign the sheets for those months when you return. To make things quicker for me, I had been to the doctors at least once a month 3 months before considering the surgery,for other issues, so he back dated those 3 months, using my documented weight from the previous visits.