Ohio Rev. Code § 4757.21: Diagnosing and treatment of mental and emotional disorders.

A person licensed under this chapter to practice as a licensed professional clinical counselor or a licensed professional counselor may diagnose and treat mental and emotional disorders, except that a licensed professional counselor may do so only under the supervision of a psychologist, psychiatrist, licensed professional clinical counselor, independent marriage and family therapist, or independent social worker. A licensed professional clinical counselor or licensed professional counselor may engage in the private practice of professional counseling as an individual practitioner or as a member of a partnership or group practice.