CPT 93644 S‑ICD Evaluation Reimbursement | OpenPayer

Summary & Overview

CPT 93644: Electrophysiology Evaluation and Programming of S-ICD

CPT code 93644 covers electrophysiology evaluation and programming for subcutaneous implantable cardioverter-defibrillator (S-ICD) systems, including induction or attempted induction of arrhythmia, determination of termination thresholds, sensing evaluation, and device programming. This procedure is clinically significant because it verifies device function, optimizes therapy delivery, and ensures patient safety following S-ICD implantation or during follow-up. Nationally, appropriate coding and coverage of S-ICD evaluation procedures affect hospital and ambulatory cardiac electrophysiology practice patterns and device management workflows.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what CPT code 93644 represents, typical settings where the service is performed, and the clinical context for the procedure. The publication summarizes common payer engagement around device testing and programming, outlines standard clinical objectives of the service, and highlights relevant billing considerations and benchmarks where available.

This resource is intended to provide clinicians, billing staff, and policy analysts with a clear, national-level summary of CPT code 93644, its clinical purpose, and the types of information to review when assessing coverage, utilization, or coding practice.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 93644electrophysiologyS-ICDdevice programmingcardiac electrophysiologydevice testingambulatory surgeryhospital services

Billing Code Overview

CPT code 93644 describes an electrophysiology evaluation of a subcutaneous implantable cardioverter-defibrillator (S-ICD) system. The procedure involves inducing or attempting to induce an arrhythmia, determining the energy threshold required to terminate the arrhythmia, assessing device sensing parameters, and programming or reprogramming the S-ICD for therapeutic settings.

Service type: Electrophysiology device evaluation and programming
Typical site of service: Hospital-based electrophysiology lab or cardiac device clinic

Clinical & Coding Specifications

Clinical Context

A 62-year-old patient with ischemic cardiomyopathy and reduced left ventricular ejection fraction presents for evaluation after implantation of a subcutaneous implantable cardioverter-defibrillator (S-ICD). The patient reports an episode of syncope and device-recorded high-rate events suggestive of ventricular tachycardia. The electrophysiology team schedules a supervised device evaluation in the cardiac electrophysiology laboratory. The procedure includes induction, or attempted induction, of ventricular arrhythmia under controlled conditions, assessment of the S-ICD sensing vectors, measurement of defibrillation threshold or shock efficacy for arrhythmia termination, and programming or reprogramming of therapy settings. Continuous hemodynamic and electrocardiographic monitoring is used; resuscitation equipment and external defibrillation are on standby. The attending electrophysiologist documents baseline rhythm, sedation level, medications held, arrhythmia induction maneuvers, energy and waveform used for termination tests, sensing and impedance measurements, device interrogation screenshots, and final programmed parameters. Typical site of service is an outpatient or inpatient cardiac electrophysiology lab within a hospital or ambulatory surgical center. The service is coded to reflect the professional performance of the EP procedure and device programming as described in 93644.

Coding Specifications

Modifier	Description	When to Use
`26`

CPT 93600: His-Bundle Electrophysiologic Recording

CPT-93653-ELECTROPHYSIOLOGY-STUDY-CATHETER-ABLATION-SUPRAVENTRICULAR-TACHYCARDIA

CPT 93653: Electrophysiology Study with Catheter Ablation for Supraventricular Tachycardia

CPT-93655-POST-ABLATION-ELECTROPHYSIOLOGY-STUDY-WITH-ABLATION

CPT 93655: Post‑Ablation Electrophysiology Study with Ablation

CPT-93650-CATHETER-ABLATION-FOR-ARRHYTHMIA

CPT 93650: Catheter Cardiac Ablation for Arrhythmia

CPT-93619-INTRACARDIAC-ELECTROPHYSIOLOGY-STUDY-MULTI-ELECTRODE

CPT 93619: Intracardiac Electrophysiology Study with Multiple Electrode Catheters

CPT-93622-LEFT-VENTRICULAR-PACING-AND-RECORDING-ADD-ON

CPT 93622: Left Ventricular Pacing and Recording (Add-On)

93656-COMPREHENSIVE-ELECTROPHYSIOLOGIC-EVALUATION-INCLUDING

CPT 93656: Electrophysiologic Evaluation and Ablation for Atrial Fibrillation

CPT-93641-ICD-LEAD-AND-PULSE-GENERATOR-TESTING

CPT 93641: ICD Lead and Pulse Generator Testing

CPT-93642-PACEMAKER-DEFIBRILLATOR-DEVICE-REPROGRAMMING-EVALUATION

CPT 93642: Evaluation and Reprogramming of Pacemaker-Defibrillator System

CPT-93662-INTRACARDIAC-ECHOCARDIOGRAPHY-ADD-ON-IMAGE-GUIDANCE

CPT 93662: Intracardiac Echocardiography, Add-On Image Guidance

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Taxonomy Code	Specialty	Notes
`207RH0000X`	Cardiology — Electrophysiology	Physicians who perform invasive EP studies and device testing.
`208D00000X`	Cardiology	General cardiologists who may participate in device management and follow-up.
`208000000X`	Internal Medicine	Hospitalists or internists involved in peri-procedural medical management.
`363L00000X`	Registered Nurse — Electrophysiology	Nurses specialized in EP lab monitoring and device programming support.
`285100000X`	Physician Assistant	PAs who assist in device procedures and programming under physician supervision.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I49.01`	Ventricular fibrillation	Primary arrhythmia targeted by S-ICD testing and defibrillation threshold determination.
`I47.2`	Ventricular tachycardia	Induced or observed arrhythmia during EP testing to assess device therapy efficacy.
`I50.22`	Chronic systolic (congestive) heart failure	Underlying cardiomyopathy indication for S-ICD implantation and later evaluation.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Common comorbidity in patients with ischemic cardiomyopathy who receive S-ICDs.
`Z45.017`	Encounter for adjustment and management of automatic implantable cardiac defibrillator	Relevant encounter code for device management and reprogramming services like `93644`.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33207`	Insertion of subcutaneous implantable defibrillator system including subcutaneous lead(s)	Performed prior to `93644`; provides the implanted system that later requires evaluation and testing.
`33210`	Removal of subcutaneous lead(s) only	May be performed if sensing or lead position issues are identified during or after `93644`.
`93288`	Interrogation device evaluation remote; transtelephonic or remote monitoring transmission	Common follow-up modality for ongoing S-ICD surveillance after in-person `93644` evaluation.
`93299`	Unlisted cardiovascular service or procedure	Used rarely for novel or atypical device evaluation services not described by existing codes; not first-line.
`93653`	Comprehensive electrophysiologic evaluation including insertion and repositioning of multiple catheters	Different EP study that may be performed if intracardiac mapping or ablation is required after findings from `93644`.

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