| 37.0 | Pericardiocentesis |
| 37.10 | Incision of heart, not otherwise specified |
| 37.11 | Cardiotomy |
| 37.12 | Pericardiotomy |
| 37.20 | Noninvasive programmed electrical stimulation [NIPS] |
| 37.21 | Right heart cardiac catheterization |
| 37.22 | Left heart cardiac catheterization |
| 37.23 | Combined right and left heart cardiac catheterization |
| 37.24 | Biopsy of pericardium |
| 37.25 | Biopsy of heart |
| 37.26 | Catheter based invasive electrophysiologic testing |
| 37.27 | Cardiac mapping |
| 37.28 | Intracardiac echocardiography |
| 37.29 | Other diagnostic procedures on heart and pericardium |
| 37.31 | Pericardiectomy |
| 37.32 | Excision of aneurysm of heart |
| 37.33 | Excision or destruction of other lesion or tissue of heart, open approach |
| 37.34 | Excision or destruction of other lesion or tissue of heart, endovascular approach |
| 37.35 | Partial ventriculectomy |
| 37.36 | Excision, destruction, or exclusion of left atrial appendage (LAA) |
| 37.37 | Excision or destruction of other lesion or tissue of heart, thoracoscopic approach |
| 37.41 | Implantation of prosthetic cardiac support device around the heart |
| 37.49 | Other repair of heart and pericardium |
| 37.51 | Heart transplantation |
| 37.52 | Implantation of total internal biventricular heart replacement system |
| 37.53 | Replacement or repair of thoracic unit of (total) replacement heart system |
| 37.54 | Replacement or repair of other implantable component of (total) replacement heart system |
| 37.55 | Removal of internal biventricular heart replacement system |
| 37.60 | Implantation or insertion of biventricular external heart assist system |
| 37.61 | Implant of pulsation balloon |
| 37.62 | Insertion of temporary non-implantable extracorporeal circulatory assist device |
| 37.63 | Repair of heart assist system |
| 37.64 | Removal of external heart assist system(s) or device(s) |
| 37.65 | Implant of single ventricular (extracorporeal) external heart assist system |
| 37.66 | Insertion of implantable heart assist system |
| 37.67 | Implantation of cardiomyostimulation system |
| 37.68 | Insertion of percutaneous external heart assist device |
| 37.70 | Initial insertion of lead [electrode], not otherwise specified |
| 37.71 | Initial insertion of transvenous lead [electrode] into ventricle |
| 37.72 | Initial insertion of transvenous leads [electrodes] into atrium and ventricle |
| 37.73 | Initial insertion of transvenous lead [electrode] into atrium |
| 37.74 | Insertion or replacement of epicardial lead [electrode] into epicardium |
| 37.75 | Revision of lead [electrode] |
| 37.76 | Replacement of transvenous atrial and/or ventricular lead(s) [electrode] |
| 37.77 | Removal of lead(s) [electrode] without replacement |
| 37.78 | Insertion of temporary transvenous pacemaker system |
| 37.79 | Revision or relocation of cardiac device pocket |
| 37.80 | Insertion of permanent pacemaker, initial or replacement, type of device not specified |
| 37.81 | Initial insertion of single-chamber device, not specified as rate responsive |
| 37.82 | Initial insertion of single-chamber device, rate responsive |
| 37.83 | Initial insertion of dual-chamber device |
| 37.85 | Replacement of any type pacemaker device with single-chamber device, not specified as rate responsive |
| 37.86 | Replacement of any type of pacemaker device with single-chamber device, rate responsive |
| 37.87 | Replacement of any type pacemaker device with dual-chamber device |
| 37.89 | Revision or removal of pacemaker device |
| 37.90 | Insertion of left atrial appendage device |
| 37.91 | Open chest cardiac massage |
| 37.92 | Injection of therapeutic substance into heart |
| 37.93 | Injection of therapeutic substance into pericardium |
| 37.94 | Implantation or replacement of automatic cardioverter/defibrillator, total system [AICD] |
| 37.95 | Implantation of automatic cardioverter/defibrillator lead(s) only |
| 37.96 | Implantation of automatic cardioverter/defibrillator pulse generator only |
| 37.97 | Replacement of automatic cardioverter/defibrillator lead(s) only |
| 37.98 | Replacement of automatic cardioverter/defibrillator pulse generator only |
| 37.99 | Other operations on heart and pericardium |
