Non-emergency air and ground ambulance services are covered if ordered and approved by a participating provider. Ambulance services in conjunction with emergency medical treatment provided outside the participating physician group (PPG) or Health Net service area are considered reinsured services. Services originating outside the PPG or Health Net service area and terminating inside the service area are also considered reinsured services. All emergency air and ground ambulance services are covered regardless of whether the services were obtained in or out of the service area. They do not require prior authorization.