The ASO shall establish a process, through a utilization review system, for authorization of specialty mental health services. The ASO shall authorize services that are: Medically necessary; Of a type, frequency, and duration that are consistent with expected results and cost-effective; and Delivered in a manner consistent with this chapter. Preauthorization is not required before a provider renders services in an emergency department. Except as provided in Regulation .08C of this chapter, no payment shall be rendered for services that have not been authorized.