For participants in the REM program, the Program covers and shall reimburse for services specified in Regulations .10 and .11 of this chapter when these services are: Medically necessary; Prescribed by a: Physician; Physician assistant; or Nurse practitioner; Preauthorized, when required, by the Department; Rendered in accordance with accepted health professional standards; Rendered in accordance with the treatment plan or physician's, physician assistant’s, or nurse practitioner’s order, or both; and Delivered by an enrolled Medical Assistance provider.