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    OpenPayerBilling CodesCardiac Device Implantation, Analysis, Relocation and Removal ProceduresCPT cpt-0521t-wireless-cardiac-stimulator-left-ventricular-pacing-interrogation-report
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    CPT 0521T: Interrogation of Wireless LV Pacing System

    CPT code 0521T describes an in-person interrogation of a wireless cardiac stimulator system for left ventricular pacing, including review of the device telemetry and preparation of a written report; service type is device interrogation and evaluation, and the typical site of service is an outpatient clinic or hospital-based device clinic during a patient encounter. Data not available in the input.

    For related coverage guidance, see recent payer policy updates: Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use Disorders, Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use Disorders, Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use Disorders.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 68-year-old patient with ischemic cardiomyopathy and symptomatic heart failure attends a device clinic visit for interrogation of a wireless left ventricular (LV) cardiac stimulator system. The patient presents in person for scheduled follow-up after LV lead placement as part of a cardiac resynchronization therapy (CRT) system. The clinic medical assistant obtains vital signs and confirms device patient-reported symptoms (fatigue, exertional dyspnea). The cardiac electrophysiology nurse connects the programmer or communicates with the patient-worn wireless transceiver to interrogate the implanted LV stimulator, assesses lead integrity, battery status, pacing thresholds, sensing parameters, and any recorded arrhythmia episodes. The electrophysiologist or authorized provider reviews the telemetry and device diagnostic reports, adjusts device settings if indicated, documents the findings, and prepares a formal report. The service is reported once per patient encounter using 0521T for in-person interrogation and report preparation specific to left ventricular pacing via a wireless cardiac stimulator system. Typical workflow includes device interrogation, provider review, report generation, and documentation in the electronic medical record prior to patient discharge from the clinic.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    93290Programming device evaluation (in-person) with iterative adjustment of pacing and sensing parameters; without reportOften performed alongside interrogation when device reprogramming is required; 0521T complements by documenting LV stimulator-specific wireless interrogation and report
    93293Interrogation device evaluation (remote or in-person) with external patient monitor analysis, includes reportRemote monitoring alternative; may be used before or after in-person 0521T encounters for ongoing surveillance
    33233Insertion of pacing cardioverter-defibrillator or CRT-D, single or dual lead, with transvenous lead(s)Surgical implantation procedure that precedes chronic interrogations like 0521T during follow-up visits
    33208Insertion of left ventricular lead for epicardial or transvenous approach as part of CRT device implantationProcedure that establishes left ventricular pacing capability for which subsequent 0521T interrogations are performed
    99091Collection and interpretation of physiologic data digitally stored and/or transmitted by the patient, requiring a minimum of 30 minutes of timeAncillary remote data interpretation code that may be used for extended device data review outside the single encounter documented by 0521T

    Related Modifiers

    6 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207RH0000XHematology (Internal Medicine) PhysicianAn internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, cl…
    207RC0000XCardiovascular Disease PhysicianAn internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    170300000XGenetic Counselor (M.S.)A masters trained health care provider who collects and interprets genetic family histories; assesses the risk of disease occurrence or recurrence; id…
    281P00000XChronic Disease Hospital(1) A hospital including a physical plant and personnel that provides multidisciplinary diagnosis and treatment for diseases that have one or more of …
    1835P2201XAmbulatory Care PharmacistA licensed pharmacist who has demonstrated specialized knowledge and skill in the provision of integrated, accessible health care services by pharmaci…
    173C00000XReflexologistReflexologists perform a non-invasive complementary modality involving thumb and finger techniques to apply alternating pressure to the reflexes withi…
    225XN1300XNeurorehabilitation Occupational TherapistRespiratory, Developmental, Rehabilitative and Restorative Service Providers · Occupational Therapist

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    E11.9Type 2 diabetes mellitus without complications
    E78.5Hyperlipidemia, unspecified
    I20.9Angina pectoris, unspecified
    I25.10Atherosclerotic heart disease of native coronary artery without angina pectoris
    I25.110Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
    I33.0Acute and subacute infective endocarditis
    I34.0Nonrheumatic mitral (valve) insufficiency
    I34.1Nonrheumatic mitral (valve) prolapse
    I34.9Nonrheumatic mitral valve disorder, unspecified
    I35.0Nonrheumatic aortic (valve) stenosis

    Showing 1–10 of 28

    Related Payer Policy Updates

    Specialty: Anesthesiology1 / 3

    9 rows

    PolicyPayerEffective Date
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric or Substance Use DisordersPremera Bluecross2026-07-01
    Elective Inpatient Services (for Idaho Only)UnitedHealthcare2026-06-01
    Sites of Servicepriority health2026-06-01
    Coverage for Ambulatory Surgery Unit (ASU)/Outpatient Facility and Anesthesia for Dental Servicesuniverahealthcare2026-05-21
    Mm_0579_Coveragepositioncriteria_Anesthesia_Services_Selected_Nerve_BlocksCigna2026-05-15
    Intravenous Anesthetics for the Treatment of Chronic Pain and Psychiatric DisordersBlue Cross Blue Shield - North Carolina2026-04-01

    Related Codes

    CPT-0515T-WIRELESS-CARDIAC-STIMULATOR-IMPLANTATION-LEFT-VENTRICLE

    CPT 0515T: Implant Wireless Cardiac Stimulator Generator, Transmitter, LV Electrode

    CPT-0516T-WIRELESS-LEFT-VENTRICULAR-ELECTRODE-IMPLANTATION

    CPT 0516T: Wireless Left Ventricular Electrode Insertion

    CPT-0517T-LEFT-VENTRICULAR-WIRELESS-CARDIAC-STIMULATOR-IMPLANT

    CPT 0517T: Insertion of Pulse Generator for Wireless Left Ventricular Pacing

    CPT-0518T-LEFT-VENTRICULAR-PULSE-GENERATOR-BATTERY-REMOVAL

    CPT 0518T: Removal of Pulse Generator Battery for Left Ventricular Pacing

    CPT-0519T-WIRELESS-CARDIAC-STIMULATOR-PULSE-GENERATOR-REPLACEMENT

    CPT 0519T: Pulse Generator and Transmitter Replacement for LV Pacing

    CPT-0520T-LEFT-VENTRICULAR-PULSE-GENERATOR-BATTERY-REPLACEMENT

    CPT 0520T: Pulse Generator Battery Replacement for Wireless LV Pacing

    CPT-0522T-WIRELESS-LEFT-VENTRICULAR-STIMULATOR-PROGRAMMING-EVALUATION

    CPT 0522T: Left Ventricular Pacing Device Interrogation and Reprogramming

    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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