CPT 0646T: Transcatheter Tricuspid Valve Implantation or Replacement

CPT code 0646T represents a transcatheter tricuspid valve implantation or replacement performed via a percutaneous catheter delivered through a small skin incision and threaded to the heart. As an emerging structural heart intervention, this procedure expands options for patients with tricuspid valve disease who are at elevated risk for open surgical repair. Nationally, adoption of transcatheter tricuspid therapies is clinically significant because it affects referral patterns, cardiac catheterization lab utilization, and payer coverage decisions.

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, typical site-of-service settings, and the service type for CPT code 0646T. The publication outlines common modifiers and ancillary billing considerations where available, and summarizes payer coverage patterns and benchmarks when present. Policy updates, coding guidance, and reimbursement considerations related to transcatheter tricuspid valve procedures are highlighted to inform billing teams, cardiovascular programs, and policy stakeholders.

This resource is intended to provide a national-level briefing on what CPT code 0646T represents, why it matters in structural heart care delivery, and what topics—such as coverage, coding modifiers, and site-of-service implications—readers can expect to explore in greater detail.

Billing Code Overview

CPT code 0646T describes a transcatheter implantation or replacement of a prosthetic tricuspid valve. The procedure involves the provider inserting a catheter through a small incision in the skin, threading the catheter through a vessel to the heart, and delivering or replacing a prosthetic valve at the tricuspid position.

Service type: Transcatheter tricuspid valve implantation/replacement

Typical site of service: Cardiac catheterization laboratory or hybrid operating room

Clinical Context

A 78-year-old patient with severe tricuspid regurgitation presents with progressive right-sided heart failure symptoms including peripheral edema, ascites, and exertional fatigue. The patient has prohibitive risk for open-heart surgery due to prior cardiac surgeries, frailty, and multiple comorbidities (e.g., chronic kidney disease, COPD). After multidisciplinary heart team evaluation, the patient is scheduled for a transcatheter tricuspid valve replacement. In the hybrid cardiac catheterization suite or cardiac operating room with hybrid capabilities, the interventional cardiologist or cardiac surgeon obtains vascular access through a small skin incision (commonly femoral or internal jugular), advances a delivery catheter under fluoroscopic and echocardiographic guidance to the tricuspid valve, and deploys a prosthetic valve. Intra-procedural transesophageal echocardiography and hemodynamic monitoring are used to confirm valve position and function. The patient may require conscious sedation or general anesthesia and is monitored post-procedure in a cardiac intensive care unit for hemodynamic stability, vascular access site assessment, rhythm monitoring, and anticoagulation management. Typical site of service is an inpatient hospital setting or an ambulatory surgical center with hybrid capabilities when appropriate.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — default claim submission	Use when no specific modifier applies to the service.

Taxonomy Code	Specialty	Notes
208D00000X	Cardiothoracic Surgery	Surgeons who may perform or assist with transcatheter valve procedures in hybrid OR settings.
207RC0000X	Interventional Cardiology	Interventional cardiologists who perform transcatheter valve implantations and catheter-based interventions.
207RP0000X	Adult Cardiovascular Disease	Cardiology specialists involved in pre- and post-procedure management and heart team decision-making.
208000000X	General Surgery (Cardiac-trained)	Cardiac-trained general surgeons involved in hybrid procedures or surgical backup.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I07.1`	Rheumatic tricuspid insufficiency	Chronic rheumatic disease causing tricuspid valve dysfunction potentially requiring valve replacement.
`I34.1`	Nonrheumatic tricuspid (valve) insufficiency	Primary tricuspid regurgitation from nonrheumatic causes leading to symptoms addressed by valve replacement.
`I36.1`	Tricuspid stenosis	Tricuspid valve narrowing that may be treated with valve replacement when severe.
`I40.0`	Rheumatic tricuspid stenosis with insufficiency	Mixed tricuspid valve disease that can necessitate prosthetic valve implantation.
`I50.9`	Heart failure, unspecified	Right-sided or biventricular heart failure secondary to tricuspid valve disease often present in candidates for valve replacement.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93451`	Right heart catheterization including measurement(s) of oxygen content and cardiac output, when performed	Performed pre- or intra-procedurally to assess hemodynamics and guide valve selection and timing.
`93355`	Echocardiography, transesophageal, real-time with image documentation, including probe placement, during intraoperative or intra-procedural monitoring	Commonly used intra-procedurally to guide valve positioning and evaluate function immediately after deployment.
`36415`	Collection of venous blood by venipuncture	Performed for baseline labs, coagulation studies, and post-procedure monitoring.
`36556`	Insert non-tunneled centrally inserted central venous catheter; age 5 years or older	May be used when central access is required for monitoring or medication administration during the procedure.
`92980`	Transcatheter therapy for structural heart disease percutaneous valve implantation, aortic, pulmonary, mitral, or tricuspid (note: used for related structural interventions when specified)	Related structural heart intervention codes for percutaneous valve therapies; used in claims workflows when other valve procedures are performed in the same episode.

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Summary & Overview