A licensed marriage and family therapist may use accepted classifications of signs, symptoms, dysfunctions and disorders, such as the Diagnostic and Statistical Manual of Mental Disorders, published by the American Psychiatric Association, or an equivalent classification system as determined by the department, provided that such use is consistent with the practice of marriage and family therapy as defined in section 8403 (1) of the Education Law.
N.Y. Comp. Codes R. & Regs. Tit. 8 §§ 79-10.5