CPT 0746T: Radiation Ablation Treatment Planning for Arrhythmia

CPT code 0746T represents conversion of prior localization and mapping for an arrhythmia into a treatment plan for a separately reportable radiation ablation procedure. The code captures a focused, specialized planning service that links electrophysiologic mapping data to radiation-targeted therapy, and is relevant where noninvasive or minimally invasive radiation ablation is used to treat abnormal cardiac rhythms. Nationally, this code matters as radiation-based arrhythmia therapies and hybrid treatment approaches expand, raising questions about coding specificity and coverage policies for planning services distinct from the ablation procedure itself. Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn what CPT code 0746T denotes, typical clinical and site-of-service contexts, and which major payers are considered in coverage discussions. The publication provides benchmarks and policy context where available, highlights common billing and reporting considerations linked to planning versus procedural codes, and summarizes areas where documentation and coding clarity matter for claims processing. Data not available in the input is noted where applicable.

Billing Code Overview

CPT code 0746T describes a service in which a provider converts previously performed localization and mapping for an arrhythmia into a definitive treatment plan for a separately reportable radiation ablation of the site. This service is a planning and treatment preparation activity tied to radiation-based ablation for cardiac arrhythmias.

Service type: Preprocedural planning and treatment planning for radiation ablation of an arrhythmia
Typical site of service: Cardiology or radiation oncology setting, including inpatient or outpatient specialty clinics and procedural planning units where arrhythmia mapping and radiation therapy planning are performed.

Clinical Context

A 68-year-old patient with symptomatic atrial fibrillation and prior invasive mapping studies is referred for radiation-based catheter-free ablation planning. The patient previously underwent electroanatomic mapping and localization of the arrhythmogenic focus (separately reportable). The electrophysiology team reviews prior mapping data and imaging, then the radiation oncology provider converts that localization and mapping into a formal treatment plan to target the arrhythmia substrate for stereotactic radioablation. Typical workflow: pre-procedure evaluation and review of prior mapping and imaging; multidisciplinary conference between electrophysiology and radiation oncology; contouring of target volumes on CT/MRI fusion; dosimetric planning and quality assurance; documentation of the conversion of mapping/localization into the radiation ablation plan; and scheduling of the separate stereotactic radiation delivery procedure.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work required to convert mapping into a treatment plan is substantially greater than typical and must be documented with justification and time.
`52`	Reduced services

Taxonomy Code	Specialty	Notes
207RP1000X	Cardiac Electrophysiology	Electrophysiologists perform mapping and collaborate on target definition.
2084P0800X	Radiation Oncology	Radiation oncologists generate and approve the stereotactic ablation treatment plan.
208D00000X	Diagnostic Radiology	Radiologists assist with imaging fusion and target delineation when advanced imaging is required.
207L00000X	Internal Medicine (Cardiology)	Cardiologists coordinate patient care and may participate in planning discussions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I48.0`	Paroxysmal atrial fibrillation	Common arrhythmia substrate targeted when mapping localization identifies focal triggers amenable to radiation ablation.
`I48.1`	Persistent atrial fibrillation	Chronic AF requiring advanced therapies; mapping-to-radiation planning may be considered when catheter ablation is unsuitable.
`I47.2`	Ventricular tachycardia	Ventricular arrhythmias mapped invasively may be targeted by stereotactic radioablation; mapping data converted into a radiation plan.
`I49.9`	Cardiac arrhythmia, unspecified	Used when a specific arrhythmia type is not yet fully classified but mapping data exist to guide planning.
`I48.91`	Unspecified atrial fibrillation	General atrial fibrillation code used in documentation when detailed classification is pending.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`0360T`	Treatment delivery for cardiac radioablation, including imaging and verification	Represents the actual stereotactic radiation delivery session that follows conversion/planning performed under `0746T`.
`0295T`	Image-guided stereotactic radiosurgery, brain or cranial lesion (example technique code)	Analogous image-guided planning and delivery codes; demonstrates the planning-to-delivery workflow in radiosurgery contexts.
`93653`	Mapping for ventricular tachycardia, with ablation when performed	Represents invasive electrophysiology mapping that is separately reportable and provides the localization data used to derive the radiation treatment plan billed with `0746T`.
`93656`	Comprehensive electrophysiologic evaluation including 3D mapping	Common prior procedure that yields the mapping data converted into a radiation ablation plan.
`77295`	Treatment planning, complex, includes dosimetry calculation	Represents complex dosimetric planning tasks that may be performed by the radiation oncology team as part of converting mapping into a treatment plan.

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Summary & Overview