I know insurances are extremely reluctant to cover dental costs even when they're related to a medical condition. I'd suggest reading your policy closely, and maybe talking with your dentist. Sometimes it can all be in how they code the procedure; as well, I'd expect an initial denial, but if your dentist is willing to help you pursue it, it's worth a shot. You'd probably have to get your doctor and dentist to both state that the tooth problems were caused by GERD. And read the fine print in your policy about appeals.