Sec. 4. Except as provided in section 8 of this chapter, notice of a hearing to be conducted under this chapter shall be served at least fifteen (15) days in advance on the following:
(1) The patient.
(2) The guardian, guardian ad litem or court appointed special advocate appointed for a minor, parent, or custodian of a patient who is incompetent.
(3) The provider that maintains the record or the attorney general if the provider is a state institution.