CPT® Code 33277

Add-On Code

The procedure described by CPT® Code 33277 involves the insertion of a phrenic nerve stimulator transvenous sensing lead, which is performed as an adjunct to a primary procedure. This intervention is specifically designed to assist patients suffering from moderate to severe central sleep apnea (CSA), a condition characterized by the brain's temporary cessation of signaling the muscles responsible for breathing. The phrenic nerve stimulator system aims to restore rhythmic breathing by stimulating the diaphragm to contract, thereby facilitating normal respiratory function. Central sleep apnea can be triggered by various factors, including cardiovascular diseases, strokes, conditions affecting the neck or brainstem, morbid obesity, and the use of narcotics. The neurostimulator system comprises an implantable pulse generator (IPG) that is surgically placed in a subcutaneous pocket, typically located in the right pectoral region. This system also includes a stimulation lead, which is inserted into either the right brachiocephalic vein or the left pericardiophrenic vein (the latter being the preferred site), and may involve a pressure-sensing lead positioned in the azygos vein to monitor respiration. The IPG delivers electrical impulses to the phrenic nerve, prompting the diaphragm to contract and thereby restoring regular breathing patterns. The procedure is performed under conscious sedation, allowing for patient interaction and feedback throughout the process, which is crucial for ensuring proper lead placement and function.