Tag - chamber
| HCPCS Codes | Description |
| C1721 | Cardioverter-defibrillator, dual chamber (implantable) |
| C1722 | Cardioverter-defibrillator, single chamber (implantable) |
| C1882 | Cardioverter-defibrillator, other than single or dual chamber (implantable) |
| C2621 | Pacemaker, other than single or dual chamber (implantable) |