How long before approval letter expires?

[CarpeDiem129 38]

I've been approved and scheduled for sleeve surgery Wednesday. Just curious if I did decide to back out and try one more time to lose on my own, how long is my approval letter good for? Does anyone know the answer to this? I have Tricare. Just wondering if I waited another 3 months to diet/exercise and see if I could still go back and get the surgery since I was already approved or if I'd have to go through the whole process again?

Edited November 4, 2017 by Lauren_jos19

[Rubyfit4life 75]

My approval letter has an expiration date written on it. I got approved in October only valid until January. Maybe call your insurance company to check. That would suck to have to go through everything again.