Table 1.
ICD-9-CM Disease Categories and Totals for 2,477 Drugs in the Database
| ICD-9 | Therapeutic Area | Total n | % |
|---|---|---|---|
| 2 | Neoplasm | 649 | 26.20 |
| 6 | Diseases of the Nervous System and Sense Organs | 334 | 13.48 |
| 1 | Infectious and Parasitic Diseases | 260 | 10.50 |
| 3 | Endocrine, Nutritional and Metabolic Diseases, and Immunity Disorders | 234 | 9.45 |
| 8 | Diseases of the Respiratory System | 168 | 6.78 |
| 7 | Diseases of the Circulatory System | 147 | 5.93 |
| 13 | Diseases of the Musculoskeletal System and Connective Tissue | 119 | 4.80 |
| 9 | Diseases of the Digestive System | 100 | 4.04 |
| 5 | Mental Disorders | 102 | 4.12 |
| 12 | Diseases of the Skin and Subcutaneous Tissue | 98 | 3.96 |
| 10 | Diseases of the Genitourinary System | 71 | 2.87 |
| 17 | Injury and Poisoning | 63 | 2.54 |
| 4 | Diseases of the Blood and Blood Forming Organs | 57 | 2.30 |
| 16 | Symptoms, Signs, and Ill-Defined Conditions | 50 | 2.02 |
| Suppl V | Supplementary Classification of Factors Influencing Health Status and Contact with Health Services | 11 | 0.44 |
| Suppl E | Supplementary Classification of External Causes of Injury and Poisoning | 6 | 0.24 |
| 14 | Congenital Anomalies | 6 | 0.24 |
| 11 | Complications of Pregnancy, Childbirth, and the Puerperium | 1 | 0.04 |
| 15 | Certain Conditions Originating in the Perinatal Period | 1 | 0.04 |