Health Net is responsible for reviewing the case file, requesting any additional information needed from the participating provider, and upholding or overturning the denial. In addition, Health Net is responsible for informing members of their right to appeal to the Department of Insurance (DOI). This includes sending members an application form and addressed envelope so they can request an independent medical review (IMR) through the DOI for member appeals that have been denied for lack of medical necessity or for investigational or experimental treatment. The IMR organization reviews the case, prepares a written decision, including its rationale, and submits the decision to the DOI, member and Health Net. Health Net accepts the IMR recommendation, then sends the IMR decision and rationale to the participating provider and notifies the member in writing whether the denial was upheld or overturned. If the denial is upheld, the member has the right to request arbitration.