Summary & Overview
CPT 33406: Aortic Valve Replacement with Allograft, Open Surgical Approach
CPT code 33406 represents an open aortic valve replacement performed on cardiopulmonary bypass using an allograft and a freehand surgical technique. This high-acuity cardiac surgical procedure addresses severe aortic valvular disease and is performed to restore systemic blood flow. Nationally, the code is important because it captures resource-intensive inpatient cardiothoracic surgery that affects hospital surgical service lines, bundled payment calculations, and high-cost case-mix for payers and Medicare.
Key payers in the coverage landscape include Aetna, Blue Cross Blue Shield plans, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for the procedure, typical site-of-service implications, and what to expect from payer coverage and claims handling in broad terms. The publication summarizes benchmarks where available, highlights common billing and reporting considerations, and outlines relevant policy themes affecting reimbursement and utilization for major national payers and Medicare.
This analysis is intended for clinicians, coding professionals, revenue cycle managers, and policy analysts seeking a clear, national-level summary of CPT code 33406, its clinical role, and the administrative context surrounding inpatient aortic valve allograft replacement.
Billing Code Overview
CPT code 33406 describes an open surgical aortic valve replacement with allograft performed with the patient on cardiopulmonary bypass using a freehand technique. The procedure involves removing a diseased or defective aortic valve and replacing it with an allograft (a human tissue graft) to restore effective systemic blood flow.
Service Type: Cardiac surgery — open aortic valve replacement with allograft
Typical Site of Service: Hospital operating room with cardiothoracic surgical team, inpatient setting
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with symptomatic severe aortic valve disease (chronic aortic stenosis with calcific degeneration) is evaluated for surgical aortic valve replacement. Preoperative workup includes transthoracic and transesophageal echocardiography confirming a decreased aortic valve area and elevated gradients, coronary angiography to assess coronary anatomy, baseline laboratory testing, and consultation with cardiothoracic surgery and anesthesia. The operating surgeon places the patient on cardiopulmonary bypass via a median sternotomy, excises the diseased native aortic valve, and implants an allograft (human aortic valve homograft) using a freehand technique to restore outflow. Postoperative workflow includes transfer to the cardiac intensive care unit for hemodynamic stabilization, serial echocardiography to assess valve function, anticoagulation management as indicated, wound care, and discharge planning with outpatient cardiology follow-up.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier — standard reporting | Use when no modifier is applicable and the service is unmodified. |
22 | Increased procedural services | Use when the procedure required substantially greater effort or complexity beyond typical expectations. |