Summary & Overview
CPT 33366: Transapical Transcatheter Aortic Valve Replacement (TAVR/TAVI)
CPT code 33366 designates transcatheter aortic valve replacement performed through a transapical approach — access via the apex of the left ventricle. As a specific TAVI/TAVR technique, this code captures procedures where the valve is delivered through the cardiac apex rather than transfemoral or other access routes. Nationally, transapical TAVR remains an important option when peripheral vascular access is unsuitable, and accurate coding is critical for procedure classification, quality reporting, and claims processing.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for CPT code 33366, typical sites of service, and the service type. The publication summarizes national billing and coding considerations, common modifier usage (listed separately), and the relationships between this code and related transcatheter aortic valve procedures. It also provides benchmarking context and policy updates relevant to payers and hospital billing teams.
This summary is intended to help revenue-cycle professionals, clinicians, and policy analysts understand where 33366 fits within the spectrum of TAVR coding and payer coverage patterns, and what national coding and billing considerations apply.
Billing Code Overview
CPT code 33366 describes replacement of the aortic valve performed through the lumen of a catheter via transapical exposure (through the apex of the left ventricle). This procedure is a form of transcatheter aortic valve implantation/replacement (TAVI/TAVR) that uses a transapical access route rather than transfemoral or other approaches.
Service type: Aortic valve replacement via transcatheter, transapical approach
Typical site of service: Hospital operating room or hybrid cardiac catheterization suite, often performed by cardiothoracic surgery or interventional cardiology teams.
Clinical & Coding Specifications
Clinical Context
A typical patient is an elderly individual with severe, symptomatic aortic stenosis who is a high-risk or prohibitive-risk candidate for open surgical aortic valve replacement. The patient presents with progressive exertional dyspnea, angina, syncope, or heart failure symptoms and has imaging confirmation of severe aortic valve calcification and aortic annulus measurements suitable for transapical access. Pre-procedure workup includes transthoracic and transesophageal echocardiography, gated CT angiography of the chest to assess valve anatomy and access route, cardiac catheterization as indicated, and multidisciplinary heart team evaluation.
On the day of service, the patient is taken to a hybrid operating room or cardiac catheterization lab with transesophageal echocardiography and fluoroscopic capability. General anesthesia is commonly used for transapical transcatheter aortic valve implantation (TAVI/TAVR via transapical approach). The cardiothoracic surgeon obtains transapical exposure through a mini-thoracotomy at the left ventricular apex, introduces the delivery sheath through the apical puncture, advances the transcatheter valve across the native aortic valve under fluoroscopic and echocardiographic guidance, deploys the valve, confirms placement and function, and secures the apical access site. Post-procedure care includes ICU monitoring for hemodynamic stability, rhythm surveillance for conduction disturbances, assessment for vascular or bleeding complications, and echocardiographic evaluation prior to transfer to the step-down unit and discharge planning.
Coding Specifications
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