Table 1.
ICD-9-CM codes used in the study
| Condition | Subcategories | ICD-9-CM codes |
|---|---|---|
| Primary inclusion diagnosis | ||
| SCD | Sickle cell thalassemia | 282.41, 282.42 |
| SCD | 282.6x | |
| Diagnosis of interest | ||
| VTE | PE | 415.1, 415.11, 415.12, 415.19 |
| DVT lower | 451.11, 451.19, 451.2, 451.81, 453.40, 453.41, 453.42 | |
| DVT upper | 451.83, 451.84, 453.82, 453.83, 453.84, 453.85, 453.86, 453.87 | |
| Other VTE | 325, 451.89, 451.9,452, 453.0, 453.1, 453.2, 453.3, 453.8, 453.89, 453.9 | |
| Comorbid diagnosis of interest | ||
| Congenital heart disease | Bulbus cordis anomalies; anomalies of cardiac septal closure | 745.745.11, 745.12, 745.2, 745.3, 745.4, 745.5, 745.61, 745.69 |
| Other congenital anomalies of the heart | 746.x | |
| Congenital anomalies of circulatory system | 747.1x, 747.21, 747.22, 747.3x, 747.4x | |
| Renal disease | Nephrotic syndrome | 581.x |
| Nephritis with membranous glomerulonephritis | 583.1 | |
| Chronic kidney disease | 585.x | |
| History of nephrotic syndrome | V13.03 | |
| Inflammatory bowel disease | Enteritis | 555.x |
| Ulcerative colitis | 556.0, 556.6, 556.8, 556.9 | |
| Stroke | Intracerebral hemorrhage | 431, 432.x |
| Occlusion and stenosis of precerebral arteries | 433.x | |
| Occlusion of cerebral arteries | 434.x | |
| Transient cerebral ischemia | 435.x | |
| History of stroke | V12.54 | |
| Cancers/neoplasms | Renal tumors | 189.0 |
| Brain tumors | 191.x | |
| Leukemia | 204.x, 205.x, 206.x, 207.x, 208.x | |
| Bone marrow transplant | Bone marrow transplantation | 41.0x |
| Transfusion | 99.01, 99.04, 99.74 | |
| Obesity | Obesity | 278.0x |