| Code |
Meaning |
| VOO | Asynchronous ventricular pacemaker; no adaptive rate control or antitachyarrhythmia functions |
| VVI | Ventricular "demand" pacemaker with electrogram-waveform telemetry; no adaptive rate control or antitachyarrhythmia functions |
| DVI | Multiprogrammable atrioventricular-sequential pacemaker; no adaptive rate control |
| DDD | Multiprogrammable "physiologic" dual-chamber pacemaker; no adaptive rate control or antitachyarrhythmia functions |
| DDI | Multiprogrammable
DDI pacemaker (with dual-chamber pacing and sensing but without
atrial-synchronous ventricular pacing); no adaptive rate control or
antitachycardia functions |
| VVIR | Adaptive-rate VVI pacemaker with escape interval controlled adaptively by one or more unspecified variables |
| DDDR | Programmable DDD pacemaker with escape interval controlled adaptively by one or more unspecified variables |
