Appendix 1. ICD-9 or CPT Codes for Identification of Variables Included in the Models.
AF indicates atrial fibrillation; CPT, Current Procedural Terminology; HTN, hypertension; ICD-9, International Classification of Diseases, Ninth Revision, Clinical Modification; LVH, left ventricular hypertrophy. * All are ICD-9 codes, except where indicated as CPT.
| Variables | Codes* |
|---|---|
| Atrial flutter | 427.323 |
| Ischemic heart disease | 410–414, 429.2, V45.81 |
| Diabetes | 250.x |
| Hypertension | Without LVH: 401.x, 403.xx, 404.00, 404.02, 404.10, 404.12, 404.90, 404.92, 405.xx, 437.2 With LVH: 402.00, 402.10, 402.90, any prior HTN code along with 429.3 |
| Heart failure | 428.xx, 402.01, 402.11, 402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, and 398.91 |
| Cardiomyopathy | 425.0, 425.1, 425.2, 425.3, 425.5, 425.7, 425.8, 425.9 |
| Chronic rheumatic heart disease | 393–398 |
| Acute rheumatic fever with heart involvement | 391.x, 392.0 |
| Other atrial arrhythmias | 427.0, 426.89 |
| Bradyarrhythmias | 427.81 |
| Pacemaker | 00.50, 00.52, 00.53, 37.71–37.79, 37.81–37.89 |
| Renal failure | Chronic: 403.01, 403.11, 403.91, 404.03, 404.12, 404.92, 404.13, 404.93, 404.93, 585.x, 586.x, 588.0, V42.0, V45.1, V56.x Acute: 584.0–584.9 |
| Liver disease | 70.32, 70.23, 70.32, 70.33, 70.44, 70.54, 70.6, 70.9, 456.0–456.2, 570.x, 571.x, 572.2–572.8, 573.3, 573.4, 573.8, 573.9, V42.7 |
| Thyroid disease | 240–246 |
| Pulmonary disease | 416.8, 416.9, 490.x–505.x, 506.4, 508.1, 508.8 |
| Cancer | 196.x–199.x, 200.x–202.x, 203.0, 238.6, 140.x–172.x, 174.x–195.x |
| Stroke | 433–435 |
| Cerebral hemorrhage | 431–432 |
| Depression | 296.2, 296.3, 296.5, 300.4, 309.x, 311 |
| Obesity | 278.0 |
| Non-rheumatic valvular heart disease | 424.xx |
| Cardiothoracic surgery | 35.x–39.x >30 days from index AF encounter date |
| Electrical cardioversion | ICD-9 codes 99.61, 99.62, and 99.60 CPT codes 00410, 92960, and 92961 |
| AF ablation | ICD-9-CM 37.33, 37.34 CPT 93651 |
| Bleeding | ICD-9 codes 528.0–528.9, 530.7, 531.0, 531.2, 531.4, 531.6, 532.0, 532.2, 532.4, 532.6, 533.0, 533.2, 533.4, 533.6, 534.0, 534.2, 534.4, 534.6, 362.8, 379.2, 441.0, 441.1, 441.3, 161.7, 599.7, 786.3, 784.7, 431.0–432.9 |