Slightly off topic but insurance companies are notorious for this type of behavior- completely focused on all physical symptoms/norms for any type of behavioral problem/mental health treatment.
For a large part of my life I have suffered from anorexia and for two entire years went in and out of treatment centers. Getting insurance to pay for a "Decent" center and not some unspecialized ward in a psychiatric hospital was nearly impossible. It seemed everytime I had to go inpatient, the insurance company only agreed to pick it up when I was in the ER close to death. Very sad. I actually think my parents who have had to pay out of pocket for numerous, very good treatment centers are involved in a class action lawsuit against insurance companies for this sort of lack of assistance.
Hope that something works out for you !!