Table 1.
Comorbidities and Outcomes Case Definitions Using ICD‐9 and ICD‐10
| Comorbidities | ICD‐9 | ICD‐10 |
|---|---|---|
| Congestive heart failure | 398.91, 402.01, 402.11, 402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, 425.4 to 425.9, 428.x | I09.9, I11.0, I13.0, I13.2, I25.5, I42.0, I42.5 to I42.9, I43.x, I50.x, P29.0 |
| Hypertension | 401 to 405 | I10, I11–I13, I15 |
| Diabetes mellitus | 250 | E10.0, E10.1, E10.6, E10.8, E10.9, E11.0, E11.1, E11.6, E11.8, E11.9, E12.0, E12.1, E12.6, E12.8, E12.9, E13.0, E13.1, E13.6, E13.8, E13.9, E14.0, E14.1, E14.6, E14.8, E14.9 E10.2–E10.5, E10.7, E11.2–E11.5, E11.7, E12.2–E12.5, E12.7, E13.2 to E13.5, E13.7, E14.2–E14.5, E14.7 |
| Myocardial infarction | 410.x, 412.x | I21.x, I22.x, I25.2 |
| Peripheral vascular disease | 093.0, 437.3, 440.x, 441.x, 443.1 to 443.9, 47.1, 557.1, 557.9, V43.4 | I70.x, I71.x, I73.1, I73.8, I73.9, I77.1, I79.0, I79.2, K55.1, K55.8, K55.9, Z95.8, Z95.9 |
| Ischemic stroke or transient ischemic attack | 362.3, 433.x1, 434.x1, 436, 435.x | H34.1, H34.2, I63.x, I64.x, G45.x (except G45.4) |
| Chronic kidney disease | V45.1, V56, 39.95, 54.98, V42.0, 55.6, 996.81, 585.6, 586, 403.01, 403.91 | Z99.2, Z49, Z45.2, Z94.0, N18.5, N18.6, N19, I12.0 |
| Outcomes | ICD‐9 | ICD‐10 |
| Ischemic stroke | N/A | H34.1, H34.2, I63, I64 |
| Hemorrhagic stroke | N/A | I60, I61 |
| Subdural hemorrhage | N/A | I62, S06.5a |
| Gastrointestinal hemorrhage | N/A | K25, K26, K27, K28, K29, K92.0 |
ICD‐9 indicates International Classification of Diseases, Ninth Revision; ICD‐10 indicates International Classification of Diseases, Tenth Revision; N/A, not applicable.
a
S06.5 in any diagnostic position because it is an injury code.