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    v1.0.30
    OpenPayerBilling CodesImplantable Cardioverter-Defibrillator with Substernal ElectrodeCPT cpt-0577t-substernal-icd-system-electrophysiologic-evaluation-and-programming
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    CPT 0577T: ICD System Evaluation and Programming with Substernal Electrode

    CPT code 0577T describes evaluation of electrophysiologic parameters for an implantable cardioverter–defibrillator (ICD) system with a substernal electrode, including assessment of sensing and therapeutic function and adjustment of sensing and programming parameters as necessary; this is an electrophysiology device programming and device check service typically performed in an inpatient or outpatient cardiac electrophysiology lab or procedural suite with direct physician involvement.

    For related coverage guidance, see recent payer policy updates: Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation, Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation, Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillation.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old patient with ischemic cardiomyopathy and a previously implanted subcutaneous or substernal implantable cardioverter–defibrillator (ICD) system presents for routine device evaluation or because of reported palpitations and possible inappropriate therapies. The electrophysiology provider reviews device interrogation data, evaluates sensing thresholds, lead impedances, detection intervals, pacing parameters, and delivered therapies. The clinical workflow includes device interrogation using the manufacturer programmer, surface ECG correlation, provocation maneuvers if indicated to reproduce sensing issues, and stepwise reprogramming of sensing and therapeutic zones to optimize arrhythmia detection and reduce inappropriate shocks. Documentation includes pre-procedure indication, device model and serial number, measured electrophysiologic parameters, programming changes implemented, and post-programming verification of sensing and therapy delivery. The typical site of service is an outpatient electrophysiology clinic or hospital-based device clinic. Procedure duration is usually brief but may extend if troubleshooting or lead testing is required.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    33207Insertion of new or replacement of permanent pacemaker with transvenous electrode(s); single leadPerformed when concomitant pacemaker lead placement or revision is required in patients with bradyarrhythmia or pacing needs during device system management.
    33208Insertion of new or replacement of permanent pacemaker with transvenous electrode(s); two leadsRelated when dual-lead pacing capability is required in conjunction with defibrillator therapy adjustments.
    33249Revision or relocation of permanent pacemaker pocket or replacement of pulse generatorMay be performed before or after interrogation/programming when generator replacement or pocket revision is necessary.
    33262Insertion or replacement of implantable cardioverter-defibrillator pulse generator only, with existing leadsPerformed when the generator is replaced and subsequent evaluation and reprogramming of sensing/therapeutic parameters are required.
    93290Interrogation device evaluation (remote) with report, includes analysis, review and reportRemote or clinic-based device interrogations that complement in-person electrophysiologic parameter evaluation and programming in 0577T.

    Related Modifiers

    10 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RH0000X
    207RC0000X
    208D00000X
    208000000X
    363L00000X
    2471C3402X
    208200000X
    163WG0600X

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    G45.9Transient cerebral ischemic attack, unspecified
    I21.3ST elevation (STEMI) myocardial infarction of unspecified site
    I21.9Acute myocardial infarction, unspecified
    I25.10Atherosclerotic heart disease of native coronary artery without angina pectoris
    I25.9Chronic ischemic heart disease, unspecified
    I34.1Nonrheumatic mitral (valve) prolapse
    I34.9Nonrheumatic mitral valve disorder, unspecified
    I35.0Nonrheumatic aortic (valve) stenosis
    I35.1Nonrheumatic aortic (valve) insufficiency
    I42.0Dilated cardiomyopathy

    Showing 1–10 of 26

    Related Payer Policy Updates

    Specialty: Cardiology1 / 3

    10 rows

    PolicyPayerEffective Date
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2027-02-05
    Percutaneous Left Atrial Appendage Closure - Medical PolicyHealth-New-England2027-02-01
    Transcatheter Mitral Valve Repair Medical PolicyHealth-New-England2027-02-01
    Cardiac Electrophysiological (EP) Studies and Cardiac Ablation of Abnormal Electrical RhythmsCigna2027-01-15
    Outpatient Cardiology Procedures for EviCore Arrangement (for Oxford Only)Colorado Rocky Mountain Health Plans2026-11-01
    Biomarkers for Myocardial Infarction and Chronic Heart Failure Reimbursement PolicyHealthfirst2026-11-01
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2026-11-01
    Percutaneous Left Atrial Appendage Closure Devices for Stroke Prevention in Atrial Fibrillationpremerabluecrossofwashington2026-11-01

    Related Codes

    CPT-0571T-SUBSTERNAL-ICD-IMPLANTATION-REPLACEMENT

    CPT 0571T: Substernal ICD Implantation or Replacement

    CPT-0572T-SUBSTERNAL-IMPLANTABLE-DEFIBRILLATOR-ELECTRODE-PLACEMENT

    CPT 0572T: Substernal Implantable Defibrillator Electrode Insertion

    CPT-0573T-SUBSTERNAL-DEFIBRILLATOR-ELECTRODE-REMOVAL

    CPT 0573T: Substernal Implantable Defibrillator Electrode Removal

    CPT-0574T-SUBSTERNAL-DEFIBRILLATOR-ELECTRODE-REPOSITIONING

    CPT 0574T: Substernal Implantable Defibrillator Electrode Reposition and Attachment

    CPT-0575T-ICD-PROGRAMMING-EVALUATION-ADJUSTMENT

    CPT 0575T: ICD In-Person Programming and Optimization

    CPT-0576T-ICD-INTERROGATION-AND-EVALUATION-IN-PERSON

    CPT 0576T: In-Person ICD System Interrogation and Evaluation

    CPT-0578T-REMOTE-SUBSTERNAL-LEAD-ICD-FUNCTION-ANALYSIS-90-DAY

    CPT 0578T: Remote Analysis of Substernal-Lead ICD Function, Up to 90 Days

    CPT-0579T-REMOTE-ICD-INTERROGATION-TECHNICIAN-90-DAY

    CPT 0579T: Remote ICD Interrogation and Technician Evaluation, up to 90 Days

    CPT-0580T-SUBSTERNAL-IMPLANTABLE-DEFIBRILLATOR-PULSE-GENERATOR-REMOVAL

    CPT 0580T: Substernal Implantable Defibrillator Pulse Generator Removal

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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