AETNA HMO........

Has anyone had a problem with Aetna HMO? I am wanting a revision fron VBG to RNY and I am hoping that they will approve it. I don't know if they will agree with it. I have not heard anything from them as of yet. I presently live in Oklahoma City and I know which surgeons I would like to use.... Dr. Keith or his partner Dr. Lana Nelson. Any suggestions?