I'm sorry to say, but I don't think many insurances are covering IDET anymore. It's got such a low success rate that most companies are denying the procedure.
Are you considering having IDET done? I had a two level done several years ago and will be glad to answer any questions I can about if for you. I was in the very low percentage of people that IDET actually made worse.
Let me know if you would like me to give you some more information or answer some questions for you...