CPT® Code 33240

The procedure described by CPT® Code 33240 involves the insertion of an implantable defibrillator pulse generator, specifically in patients who already have a single lead in place. This device, commonly known as an automatic implantable cardioverter-defibrillator (AICD or ICD), plays a critical role in managing heart rhythm disorders. The AICD continuously monitors the heart's electrical activity and is designed to deliver various therapeutic interventions. These include anti-tachycardia pacing, which helps to prevent rapid and irregular heart rhythms; backup pacing, which ensures the heart maintains a healthy rhythm; cardioversion, which uses a mild electrical shock to restore a normal heart rhythm; and defibrillation, which employs a stronger shock to correct dangerously abnormal rhythms or to restart the heart in cases of cardiac arrest. During the procedure, the physician makes an incision in the skin, typically located in the left pectoral region, to create a subcutaneous pocket where the pulse generator will be placed. The existing lead is then connected to the new pulse generator, and the functionality of both the lead and the generator is tested to ensure they are operating correctly. Once confirmed, the pulse generator is securely positioned within the pocket, sutured to the underlying tissue, and the incision site is closed. This procedure is essential for patients requiring ongoing cardiac monitoring and intervention to prevent life-threatening arrhythmias.