Summary & Overview
CPT 33270: Subcutaneous Implantable Cardioverter-Defibrillator Insertion or Replacement
CPT code 33270 describes the surgical insertion or replacement of a permanent subcutaneous implantable cardioverter defibrillator (S-ICD) system and, when required, intraoperative testing and programming to confirm sensing and therapeutic function. This procedure is clinically significant nationwide because S-ICD systems provide a non-transvenous option for ventricular arrhythmia protection, affecting device selection, facility resource needs, and perioperative cardiac care pathways. Payers commonly involved in coverage include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find a concise explanation of the clinical service represented by CPT code 33270, the typical settings where the service is delivered, and the stakeholders involved in payment and coverage. The publication provides benchmarking context, common billing considerations, and relevant policy updates that affect reimbursement and documentation practices. Clinical context covers indications for S-ICD use, intraoperative testing components such as defibrillation threshold evaluation and arrhythmia induction, and the role of programming in achieving effective therapy. Policy and billing sections summarize typical payer coverage approaches, documentation elements that support medical necessity, and practical coding relationships. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 33270 describes the insertion or replacement of a permanent subcutaneous implantable cardioverter defibrillator (S-ICD) system. The procedure includes placement of the device in a subcutaneous pocket and, when necessary, intraoperative evaluation of device performance through a defibrillation threshold evaluation, induction of arrhythmia, and assessment of sensing for arrhythmia termination. The provider also programs or reprograms sensing and therapeutic parameters to meet the patient's needs.
Service type: Surgical implantable cardiac device procedure
Typical site of service: Hospital operating room or ambulatory surgical center with cardiac electrophysiology capability
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with ischemic cardiomyopathy (left ventricular ejection fraction 28%) and a history of sustained ventricular tachycardia is evaluated for protection against sudden cardiac death. After interdisciplinary review, the electrophysiology team schedules implantation of a subcutaneous implantable cardioverter defibrillator (S-ICD). On the day of service the patient undergoes pre-procedure evaluation, including device and lead selection, anesthesia assessment (general or monitored anesthesia care), and confirmation of informed consent. In the operating/procedure suite the electrophysiologist creates a subcutaneous pocket, tunnels the S-ICD lead, and implants the pulse generator. Device functionality is assessed intraoperatively by interrogating sensing vectors, performing defibrillation threshold evaluation or induction of arrhythmia as indicated, and programming sensing and therapeutic zones. Post-implant device interrogation and chest wall assessment are performed prior to discharge. Typical site of service is an ambulatory surgery center or hospital operating room/procedure suite under monitored anesthesia care or general anesthesia. The service type is a surgical implant procedure (cardiac electrophysiology device implantation).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Default/No modifier (payer-specific) | Use when no other modifier applies and payer requires a neutral indicator. |