Summary & Overview
CPT 33415: Subvalvular Aortic Stenosis Resection
CPT code 33415 designates surgical excision or incision of subvalvular aortic tissue to relieve subvalvular aortic stenosis, a rare congenital obstruction of the left ventricular outflow tract. As a specialized cardiothoracic procedure, it is clinically significant for congenital heart disease management and carries implications for hospital resource use, perioperative care, and long-term cardiac outcomes. Nationally, the procedure is performed at tertiary and specialty centers with cardiothoracic surgical capability.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a clinical and billing context for CPT code 33415, including its role in treating congenital subvalvular aortic stenosis, typical settings of care, and expected service type. The publication provides benchmarks where available, summaries of payer coverage patterns and policy considerations, and a concise clinical background to aid coding and administrative teams. Where specific input data are absent, the text notes that data are not available in the input. This resource is intended for national audiences involved in coding, reimbursement administration, and clinical program management for complex cardiac surgical services.
Billing Code Overview
CPT code 33415 describes surgical removal or incision of subvalvular tissue of the aorta to treat subvalvular aortic stenosis, a congenital condition in which thickening of the heart's walls narrows the left ventricular outflow tract and obstructs blood flow. This procedure is a cardiac surgical intervention targeting the subvalvular region beneath the aortic valve to relieve obstruction and improve hemodynamics.
Service Type: Open cardiac surgical procedure on the aortic outflow tract
Typical Site of Service: Inpatient hospital, operating room (cardiothoracic surgery)
Clinical & Coding Specifications
Clinical Context
A typical patient is a pediatric or young adult with congenital subvalvular aortic stenosis who presents with exertional dyspnea, chest pain, syncope, or a new systolic murmur. Diagnostic workup includes transthoracic echocardiography demonstrating a discrete or tunnel-like subaortic membrane or hypertrophic subvalvular tissue causing a significant gradient across the left ventricular outflow tract. Cardiac catheterization and cross-sectional imaging (CT or MRI) may be performed preoperatively for anatomic delineation and hemodynamic assessment.
The clinical workflow includes preoperative evaluation by a cardiothoracic surgeon and congenital cardiologist, perioperative anesthesia assessment, and informed consent discussing risks of bleeding, arrhythmia, valve injury, and need for concurrent procedures. The operative procedure 33415 is performed in an operating room under general endotracheal anesthesia, typically via median sternotomy and cardiopulmonary bypass with aortic cross-clamp and cardioplegic arrest. The surgeon excises or incises subvalvular fibromuscular tissue and membranes to relieve obstruction. Intraoperative transesophageal echocardiography confirms gradient reduction. Postoperative care occurs in a cardiac surgical intensive care unit with telemetry, analgesia, and anticoagulation management as indicated. Follow-up includes echocardiographic surveillance for recurrent obstruction and valve function assessment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 |