(a) The practice of social work is the application of social work theory, knowledge, methods, ethics, and the professional use of self to restore or enhance social, psychosocial, or biopsychosocial functioning of individuals, couples, families, groups, organizations, or communities.
(b) The practice of social work may include the provision of individual, conjoint, family, and group psychotherapy using the Diagnostic and Statistical Manual of Mental Disorders, the International Classification of Diseases, and other diagnostic classification systems in assessment, diagnosis, treatment, and other activities by a person licensed under this chapter.