If you need prior authorization from a network doctor or hospital, your doctor will usually do it for you. However, you should check this again by calling your plan (the numbers are listed below). If your doctor does not help you with pre-authorization, or if you are considering treatment outside the network of your plan, you will need to apply for pre-authorization yourself. Here are some common services that usually require prior authorization: You`ll find your administrator`s number on the back of your plan card. Not sure who your administrator is? Visit the plan availability tool to learn more. .