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Diagnostic codes considered to identify comorbidities.
| Code description | International Classification of Diseases 9 – Clinical Modification Codes |
|---|---|
| Asplenia or severe dysfunction of the spleen | 282.5-282.6, 289.4-289.5; 759.0 |
| Chronic renal disease or nephrotic syndrome | 581, 582, 584, 585; |
| Immunodeficiency or immunosuppression | 0420-0449, 279 |
| Chronic heart disease | 393-398, 414, 416 |
| Chronic lung disease | 490-496 |
| Chronic liver disease | 571-573 |
| Diabetes mellitus | 250 |
| Malignant neoplasms | 140-209 |
