Book excerpt: The AMA established a guide for the rating of physical impairment of the various organ systems which provides clinically sound and reproducible criteria for rating permanent impairment. Contents include- impairment evaluation; records and reports; the musculoskeletal system; the nervous system; the respiratory system; the cardiovascular system; the hematopoietic system; the visual system; ear, nose, throat, and related structures; the digestive system; the urinary and reproductive systems; the endocrine system; the skin; mental and behavioral disorders; pain.