Table 2: Values of the primary diagnosis in the final dataset. In the analysis, groups that covered less than 3.5% of encounters were grouped into “other” category.

Group nameicd9 codesNumber of encounters% of encounterDescription

Circulatory390–459, 78521,41130.6%Diseases of the circulatory system
Respiratory460–519, 7869,49013.6%Diseases of the respiratory system
Digestive520–579, 7876,4859.3%Diseases of the digestive system
Diabetes250.xx5,7478.2%Diabetes mellitus
Injury800–9994,6976.7%Injury and poisoning
Musculoskeletal710–7394,0765.8%Diseases of the musculoskeletal system and connective tissue
Genitourinary580–629, 7883,4354.9%Diseases of the genitourinary system
780, 781, 784, 790–7992,1363.1%Other symptoms, signs, and ill-defined conditions
240–279, without 2501,8512.6%Endocrine, nutritional, and metabolic diseases and immunity disorders, without diabetes
680–709, 7821,8462.6%Diseases of the skin and subcutaneous tissue
001–1391,6832.4%Infectious and parasitic diseases
290–3191,5442.2%Mental disorders
E–V9181.3%External causes of injury and supplemental classification
280–2896520.9%Diseases of the blood and blood-forming organs
320–3596340.9%Diseases of the nervous system
630–6795860.8%Complications of pregnancy, childbirth, and the puerperium
360–3892160.3%Diseases of the sense organs
740–759410.1%Congenital anomalies