Incorporating time and severity into CPT-4 visit codes.
D000043:Abstracting and Indexing / Q000592:standards*; D005245:Fee Schedules / Q000592:standards*; D007357:Insurance, Physician Services; D010548:Personal Health Services / Q000145:classification*; D012720:Severity of Illness Index; D013997:Time Factors; D014481:United States