Table 1.
ICD‐9 Diagnosis Categories and Codes
| Variable | ICD‐9 Code Numbers |
|---|---|
| ICD‐9 diagnostic codes | |
| Heart failure | 428.1, 428.21, 428.22, 428.23, 428.31, 428.32, 428.33, 428.41, 428.42, 428.43 |
| Cardiogenic shock | 785.51, 429.4, 997.1, 398.91, 402.11, 402.91, 404.11, 404.13, 404.91, 404.93 |
| Adult congenital heart diseasea | 745, 746, 747.0 to 747.4, 747.9 |
| Single ventricle | 745.3, 746.0, 746.1, 746.7 |
| Transposition of the great arteries | 745.12, 745.10, 745.19 |
| Tetralogy of Fallot | 745.2 |
| Atrioventricular septal defect | 745.60, 745.61, 745.69 |
| Ebstein anomaly | 746.2 |
| ICD‐9 procedural codes | |
| MCS | 37.52, 37.60, 37.62, 37.65, 37.66, 37.68 |
| Intra‐aortic balloon pump | 37.61 |
| Cardiac resynchronization | 00.50, 00.51, 00.52, 00.53, 00.54 |
| Right‐ and left‐sided heart catheterization | 3722, 3723 |
| Central venous catheter placement | 3893 |
| Implantation of cardiac defibrillator | 3794 |
ICD‐9 indicates International Classification of Diseases, Ninth Revision; MCS, mechanical circulatory support, including extracorporeal mechanical assistance.
a
Exclusions included pregnancy (V22.2), heart transplant (37.51)/heart‐lung transplant (33.6), and adult congenital heart disease subgroups for which ICD‐9 coding is less accurate: atrial septal defect (745.5), congenital anomalies of the cardiovascular system (747) and other connective tissue disease (756.83), and aortic stenosis (excluded congenital stenosis of aortic valve [746.3] and bicuspid aortic valve [746.4]).