| Group name | icd9 codes | Number of encounters | % of encounter | Description |
| Circulatory | 390–459, 785 | 21,411 | 30.6% | Diseases of the circulatory system | Respiratory | 460–519, 786 | 9,490 | 13.6% | Diseases of the respiratory system | Digestive | 520–579, 787 | 6,485 | 9.3% | Diseases of the digestive system | Diabetes | 250.xx | 5,747 | 8.2% | Diabetes mellitus | Injury | 800–999 | 4,697 | 6.7% | Injury and poisoning | Musculoskeletal | 710–739 | 4,076 | 5.8% | Diseases of the musculoskeletal system and connective tissue | Genitourinary | 580–629, 788 | 3,435 | 4.9% | Diseases of the genitourinary system | Neoplasms | 140–239 | 2,536 | 3.6% | Neoplasms | Other (17.3%) | 780, 781, 784, 790–799 | 2,136 | 3.1% | Other symptoms, signs, and ill-defined conditions | 240–279, without 250 | 1,851 | 2.6% | Endocrine, nutritional, and metabolic diseases and immunity disorders, without diabetes | 680–709, 782 | 1,846 | 2.6% | Diseases of the skin and subcutaneous tissue | 001–139 | 1,683 | 2.4% | Infectious and parasitic diseases | 290–319 | 1,544 | 2.2% | Mental disorders |
E–V | 918 | 1.3% | External causes of injury and supplemental classification | 280–289 | 652 | 0.9% | Diseases of the blood and blood-forming organs | 320–359 | 634 | 0.9% | Diseases of the nervous system | 630–679 | 586 | 0.8% | Complications of pregnancy, childbirth, and the puerperium | 360–389 | 216 | 0.3% | Diseases of the sense organs | 740–759 | 41 | 0.1% | Congenital anomalies |
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