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    OpenPayerBilling CodesTemporary CodesHCPCS hcpcs-q0477-power-module-patient-cable-ventricular-assist-device-replacement
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    HCPCS Level II Q0477: Power Module Patient Cable for Ventricular Assist Device

    HCPCS Level II code Q0477 describes a power module patient cable used as a replacement component for electric or electric/pneumatic ventricular assist devices; this supplies power connectivity for the device and is categorized as durable medical equipment replacement part, typically provided as a replacement/repair supply and used in inpatient hospital, outpatient hospital, home health, or durable medical equipment settings depending on clinical need and supplier arrangements.

    For related coverage guidance, see recent payer policy updates: B-Hemolytic Streptococcus Testing, Human Immunodeficiency Virus (HIV) — Coverage Criteria for Testing and Resistance Assays, Hepatitis Testing (A, B, C, D) Coverage Criteria.

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    Table of contents

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    • ModifiersCPT modifiers & usage
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    Clinical & Coding Specifications

    Clinical Context

    A patient with an implanted electric or electric/pneumatic ventricular assist device (VAD) presents for replacement of a worn or malfunctioning external power module patient cable. Typical patients are adults with advanced heart failure supported by a durable left ventricular assist device (LVAD) or biventricular assist device (BiVAD) who require outpatient or ambulatory clinic visits, home health visits, or hospital-based device service when an external cable shows wear, intermittent connectivity, or damage. The clinical workflow: the device clinic or cardiac surgery/VAD team identifies the damaged cable during routine device interrogation or when the patient reports alarm conditions or loss of external power. The patient is evaluated by a VAD-trained nurse or advanced practice provider; device interrogation and external visual inspection confirm the need for replacement. A replacement cable (Q0477) is dispensed and connected; device function and alarms are rechecked, battery and controller function verified, and patient instructed on cable care. Typical site of service includes outpatient specialty device clinics, ambulatory surgery centers for device-related procedures, hospital inpatient units during admission for device issues, and skilled home health visits when clinically appropriate. Documentation should include device serial numbers, cable condition, reason for replacement, date of service, provider performing the assessment, and post-replacement device checks.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    93662Insertion or replacement of temporary pacemaker electrode, percutaneous or epicardial (includes connection to power supply)May be performed if concomitant temporary pacing is required during VAD cable replacement or device troubleshooting.
    93750External counterpulsation therapy, per treatment session (deprecated but occasionally referenced)Not directly related; historically appears in mechanical circulatory support contexts but generally not used for VAD cable replacement.
    93799Unlisted cardiovascular service or procedureUsed when a specific CPT does not describe a unique procedure or service directly associated with complex device management during cable replacement; documentation must justify unlisted code use.
    99499Unlisted evaluation and management serviceMay be used for non-standard or intensive device clinic encounters not otherwise described by existing E/M codes when payers allow unlisted reporting.
    A9900Miscellaneous ambulatory health care services, not otherwise classified (HCPCS Level II)Used when a payer requires a miscellaneous HCPCS for non-covered or unique device-related clinic services accompanying the cable replacement.

    Note: If billing for the supply itself, Q0477 is a HCPCS Level II supply code for the power module patient cable; facility and payer rules determine whether associated CPT/E/M codes are separately billable. When CPT codes are used for related clinical tasks (evaluation, device interrogation, or operative management), documentation must support medical necessity and tie services to the device replacement.

    Related Modifiers

    7 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…
    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…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    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
    207P00000XEmergency Medicine PhysicianAn emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospit…
    363L00000XNurse Practitioner(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
    364S00000XClinical Nurse SpecialistA registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses…
    261QA0900XAmputee Clinic/CenterAn entity, facility, or distinct part of a facility providing counseling, fitting, custom design, prescriptive, and training services related to conge…
    376K00000XNurse's Aide(1) An unlicensed individual who is trained to function in an assistive role to the licensed nurse in the provision of patient/client activities as de…
    2083A0300XAddiction Medicine (Preventive Medicine) PhysicianA physician engaged in the subspecialty practice of Addiction Medicine who specializes in the prevention, evaluation, diagnosis, treatment, and recove…
    364SA2200XAdult Health Clinical Nurse SpecialistPhysician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
    261QM1103XMilitary Ambulatory Procedure Visits Operational (Transportable) Clinic/Center"Non-fixed" facilities or distinct parts of a "non-fixed" facility, providing outpatient surgical procedures requiring medically supervised recovery. …

    Related ICD-10-CM Codes

    27 rows

    ICD-10-CM CodeDescription
    I21.3ST elevation (STEMI) myocardial infarction of unspecified site
    I21.4Non-ST elevation (NSTEMI) myocardial infarction
    I22.2Subsequent non-ST elevation (NSTEMI) myocardial infarction
    I25.10Atherosclerotic heart disease of native coronary artery without angina pectoris
    I25.110Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
    I25.5Ischemic cardiomyopathy
    I26.99Other pulmonary embolism without acute cor pulmonale
    I33.0Acute and subacute infective endocarditis
    I34.1Nonrheumatic mitral (valve) prolapse
    I42.0Dilated cardiomyopathy

    Showing 1–10 of 27

    Related Payer Policy Updates

    Specialty: Infectious Disease1 / 3

    9 rows

    PolicyPayerEffective Date
    B-Hemolytic Streptococcus TestingOscar Health2026-10-01
    Human Immunodeficiency Virus (HIV) — Coverage Criteria for Testing and Resistance AssaysOscar Health2026-10-01
    Hepatitis Testing (A, B, C, D) Coverage CriteriaOscar Health2026-10-01
    Lyme Disease Testing Coverage CriteriaOscar Health2026-10-01
    Pathogen Panel TestingOscar Health2026-10-01
    Diagnostic Testing of Common Sexually Transmitted InfectionsOscar Health2026-10-01
    Testing for Vector-Borne InfectionsOscar Health2026-10-01
    Coronavirus Testing in the Outpatient SettingOscar Health2026-10-01
    Testing for Diagnosis of Active or Latent TuberculosisOscar Health2026-10-01

    Related Codes

    HCPCS-LEVEL-II-Q4139-INJECTABLE-AMNIOMATRIX-BIODMATRIX-1-CC

    HCPCS Q4139: Amniomatrix or Biodmatrix, Injectable, 1 cc

    HCPCS-LEVEL-II-Q4256-AREA-BASED-PROCEDURAL-ADD-ON-PER-SQ-CM

    HCPCS Q4256: MLG-complete Skin Graft Material, Per Sq Cm

    HCPCS-LEVEL-II-Q5132-ADALIMUMAB-AFZB-ABRILADA-10MG-INJECTION

    HCPCS Level II Q5132: Injection, adalimumab-afzb (Abrilada), 10 mg

    HCPCS-Q0035-CARDIOKYMOGRAPHY-CARDIAC-MOTION-RECORDING

    HCPCS Level II Q0035: Cardiokymography

    HCPCS-Q0081-INFUSION-THERAPY-NON-CHEMOTHERAPEUTIC-PER-VISIT

    HCPCS Level II Q0081: Infusion Therapy, Non‑Chemotherapeutic, Per Visit

    HCPCS-Q0083-CHEMOTHERAPY-NON-INFUSION-ADMINISTRATION

    HCPCS Q0083: Chemotherapy Administration, Non-Infusion Methods

    HCPCS-Q0084-CHEMOTHERAPY-INFUSION-ADMINISTRATION-PER-VISIT

    HCPCS Q0084: Chemotherapy Infusion Administration, Per Visit

    HCPCS-Q0085-CHEMOTHERAPY-INFUSION-PLUS-OTHER-TECHNIQUES-PER-VISIT

    HCPCS Q0085: Chemotherapy Infusion Plus Other Technique(s), Per Visit

    HCPCS-Q0091-PAP-SMEAR-SPECIMEN-COLLECTION-TRANSPORT

    HCPCS Q0091: Screening Papanicolaou Smear Collection and Transport

    HCPCS-Q0092-PORTABLE-XRAY-EQUIPMENT-SETUP

    HCPCS Q0092: Set-up Portable X-ray Equipment

    Showing 1–10 of 629

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    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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