CPT 0484T: Transthoracic Catheter Mitral Valve Implantation or Replacement

CPT code 0484T designates a transthoracic catheter-based procedure to implant or replace a prosthetic mitral valve for mitral valve prolapse or valve malfunction. This code captures a complex, invasive cardiac intervention that combines surgical access with catheter-delivered prosthesis, reflecting evolving treatment options for structural mitral disease. Nationally, the code matters because it documents high-acuity cardiovascular care, informs hospital and payer resource allocation, and affects billing and coverage decisions for advanced mitral therapies.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context and service characteristics, common payer considerations, and typical settings of care. The report covers available benchmarks and utilization patterns where present, summarizes relevant policy and coverage themes impacting access to transthoracic catheter mitral valve implantation, and outlines coding considerations and typical modifiers used with this service.

The publication aims to help coding, billing, and policy professionals understand how CPT code 0484T is used to represent this specialized mitral valve procedure, what to expect from payer interactions, and where to look for additional clinical and reimbursement guidance. Data not available in the input is noted where applicable.

Billing Code Overview

CPT code 0484T describes a procedure in which, through a transthoracic exposure, a provider inserts a catheter to implant or replace a prosthetic mitral valve to treat mitral valve prolapse or malfunction. This surgical, catheter-based mitral valve implantation or replacement procedure involves direct access to the heart via a transthoracic route rather than a purely percutaneous transfemoral approach.

Service type: Cardiac surgical catheter-based mitral valve implantation/replacement
Typical site of service: Inpatient or hospital operating room / hybrid cardiac catheterization laboratory

Clinical Context

A 74-year-old patient with symptomatic severe mitral regurgitation due to degenerative mitral valve prolapse is evaluated for intervention after medical therapy and diagnostic testing. The patient reports progressive dyspnea on exertion, decreased exercise tolerance, and episodes of orthopnea. Transthoracic and transesophageal echocardiography confirm significant leaflet malcoaptation and a flail posterior leaflet with left ventricular dilation and preserved systolic function. Surgical risk assessment identifies elevated operative risk from prior thoracic surgery and comorbidities, making a less invasive transthoracic catheter-based prosthetic mitral valve implantation an appropriate option.

Pre-procedure workflow includes history and physical, review of cardiac imaging (TTE/TEE, CT for annular sizing), anticoagulation management, informed consent, and pre-anesthesia testing. On the day of service the patient is taken to an operating room or hybrid cardiac catheterization suite under general anesthesia. A transthoracic exposure is created, the provider inserts a delivery catheter across the mitral valve annulus, and a prosthetic mitral valve is implanted or a previously placed prosthesis is exchanged. Intraoperative transesophageal echocardiography guides positioning and confirms valve function. Post-procedure care includes monitoring in a cardiac recovery unit or intensive care setting, anticoagulation management, echocardiographic follow-up, and discharge planning with cardiac rehabilitation as indicated.

Coding Specifications

Modifier	Description	When to Use
`22`

Taxonomy Code	Specialty	Notes
207RC0000X	Cardiothoracic Surgery	Primary specialty performing transthoracic mitral valve implantation and replacements.
207RP1001X	Interventional Cardiology	May participate in hybrid approaches and catheter-based access; imaging guidance.
207RH0000X	Cardiac Surgery	Surgeons who perform open or minimally invasive transthoracic valve procedures.
207LA0501X	Hospital Anesthesiology	Provides general anesthesia or monitored anesthesia care for the procedure.
174400000X	Registered Nurse First Assist	Assists the operating surgeon in complex valve implantation procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I34.0`	Nonrheumatic mitral (valve) prolapse	Primary indication when leaflet prolapse causes significant regurgitation requiring prosthetic valve implantation.
`I34.1`	Nonrheumatic mitral (valve) regurgitation	Describes mitral insufficiency that often prompts valve repair or replacement via transthoracic catheter approaches.
`I05.2`	Rheumatic mitral stenosis with insufficiency	Mixed disease with regurgitation component that may necessitate valve replacement when severe.
`I08.0`	Rheumatic heart disease of both mitral and aortic valves	Complex valvular disease that can necessitate mitral valve replacement as part of comprehensive management.
`I39`	Endocarditis and heart valve disorders in diseases classified elsewhere	Active or prior infective involvement of the mitral valve that may require prosthetic replacement if repair is not feasible.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33533`	Replacement, mitral valve, with prosthesis (open procedure)	Alternative open surgical mitral valve replacement; may be performed when transthoracic catheter approach is not suitable.
`93452`	Left heart catheterization including intraprocedural hemodynamic measurements and reporting, when performed	Performed pre-procedure or intra-procedure for hemodynamic assessment and catheter guidance during valve implantation.
`93312`	Echocardiography, transesophageal, intraoperative including probe placement, real-time with image documentation	Intraoperative TEE to guide device positioning, valve deployment, and immediate assessment of valve function.
`99143`	Moderate sedation services provided by the same physician performing the diagnostic or therapeutic service (initial 30 minutes)	Applicable when the implant is performed with moderate sedation rather than general anesthesia and provider documents sedation time.
`99238`	Hospital discharge day management; 30 minutes or less	Postoperative billing for physician discharge services following inpatient stay after valve implantation.

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Summary & Overview