In this subchapter:
(1) "Serious mental illness" means the following psychiatric illnesses as defined by the American Psychiatric Association in the Diagnostic and Statistical Manual (DSM):
(A) bipolar disorders (hypomanic, manic, depressive, and mixed);
(B) depression in childhood and adolescence;
(C) major depressive disorders (single episode or recurrent);
(D) obsessive-compulsive disorders;
(E) paranoid and other psychotic disorders;
(F) schizo-affective disorders (bipolar or depressive); and
(G) schizophrenia.
(2) "Small employer" has the meaning assigned by Section 1501.002.
(3) "Autism spectrum disorder" means a neurobiological disorder that includes autism, Asperger's syndrome, or Pervasive Developmental Disorder--Not Otherwise Specified.
(4) "Neurobiological disorder" means an illness of the nervous system caused by genetic, metabolic, or other biological factors.