Medical insurance plans and policies only cover health care that is "medically necessary". Different plans define "medically necessary" in different ways, and health insurance companies often have to come up with some internal guidelines about what type of treatment will be covered for certain conditions, and when different treatment must be sought first.
This is difficult in claims involving mental health and substance abuse. Recently, a class action lawsuit was filed against United Behavioral Health ("UBH") asserting that the guidelines being used to deny claims were not in line with standard medical practice. The plaintiffs allege that UBH guidelines required claimants to receive a lower level of medical care than should have been given to them considering their medical conditions.
Read more here at California Labor Law News: click for article
