Except as provided in subsection (c) of this section, a physician shall evaluate a permanent impairment and report the evaluation to the Commission in accordance with the regulations of the Commission. A medical evaluation of a permanent impairment shall include information about: atrophy; pain; weakness; and loss of endurance, function, and range of motion. If a permanent impairment involves a behavioral or mental disorder, a licensed psychologist or qualified physician shall: perform an evaluation of only the mental or behavioral portion of the permanent impairment; and report the evaluation to the Commission in accordance with the regulations of the Commission.