CPT code 33983 represents the surgical replacement of the implantable pump in a previously placed ventricular assist device (VAD), specifically applicable to replacement of a pump in a single ventricle with use of cardiopulmonary bypass. This is a high-acuity cardiac surgical service typically performed in an inpatient operating room by cardiac surgery teams and matters nationally because it addresses device failure, pump malfunction, or need for pump upgrade — events with major implications for patient survival, hospital resource use, and payer spend.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical and billing context for CPT code 33983, including the service type and usual site of service. The publication outlines expected billing considerations, common modifiers, and where this procedure fits within cardiac surgical service lines. It also summarizes what stakeholders can expect regarding claims complexity and the potential need for inpatient surgical authorization and care coordination.

The article serves clinicians, coding professionals, and payers seeking a national-level reference for coding practice, administrative workflows, and the clinical setting associated with this specialized cardiac device procedure.