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    v1.0.30
    OpenPayerBilling CodesVein Bypass Graft ProceduresCPT cpt-35509-carotid-to-carotid-vein-bypass-graft
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    CPT 35509: Carotid-to-Carotid Vein Bypass Graft

    Medicare pays $1282 on average nationally for this procedure.

    CPT code 35509 describes a carotid-to-carotid bypass using a vein graft in which the surgeon bypasses an occluded carotid artery by connecting one carotid artery to a segment of the contralateral carotid artery with a vein graft; this is a surgical arterial bypass procedure typically performed in an operating room or other inpatient/ambulatory surgical setting to restore cerebral perfusion when direct repair or endarterectomy is not feasible.

    For related coverage guidance, see recent payer policy updates: Automated Ambulatory Blood Pressure Monitoring for Diagnosis of Hypertension in Patients with Elevated Office Blood Pressure, Cardiology - Ivabradine, Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA).

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is a 68-year-old man with symptomatic high-grade carotid artery occlusive disease who presents with recurrent transient ischemic attacks and progressive carotid stenosis not amenable to endovascular therapy. After vascular surgery consultation, imaging with carotid duplex ultrasound and CT angiography demonstrates an occluded proximal right common carotid artery with inadequate inflow on that side and a patent left common and internal carotid system. The care team schedules an open carotid-carotid bypass using an autologous vein graft to re-establish cerebral perfusion.

    Preoperative workflow includes vascular history and focused neurologic exam, medication reconciliation (antiplatelet and anticoagulation management), anesthesia assessment, duplex and CT angiography review, and informed consent documenting anticipated risks and benefits. Intraoperative workflow involves general anesthesia, exposure of both carotid arteries in the neck, harvest of the vein graft (typically greater saphenous vein), systemic heparinization, proximal and distal control of vessels, construction of the bypass graft between the patent left carotid and the target segment on the right, flow assessment, hemostasis, and wound closure.

    Postoperative workflow includes neurologic monitoring in a post-anesthesia care unit or intensive care setting, blood pressure control, antiplatelet therapy resumption per vascular surgeon instructions, graft surveillance with duplex ultrasound before discharge and at follow-up, and documentation of procedural details including graft type, laterality, and any intraoperative complications. Typical site of service is an inpatient hospital operating room with a vascular surgery team; ambulatory surgery centers are not typical for this level of open vascular reconstruction.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    35512Extra-anatomic bypass, axillary-axillary or axillary-femoral (single limb), with prosthetic graftPerformed in patients requiring extra-anatomic inflow reconstruction; alternative bypass strategy in multivessel occlusive disease
    36215Selective catheterization, major branch of internal carotid artery, with angiography, radiological supervision and interpretationDiagnostic cerebral angiography often performed preoperatively to delineate cerebral and carotid anatomy
    35301Thromboendarterectomy, carotid, with patch graft (includes monitoring and closure)Carotid endarterectomy is an alternative revascularization; may be performed on contralateral side or in staged procedures
    35631Embolectomy or thrombectomy, common carotid artery, with or without patch angioplastyPerformed if acute embolic occlusion identified requiring direct thrombectomy rather than bypass
    93925Duplex scan of extracranial arteries; bilateral studyNoninvasive surveillance and preoperative mapping of carotid disease commonly used before and after bypass

    Related Modifiers

    12 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…
    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…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    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…
    81Modifier -81 indicates a physician served as a minimal assistant surgeon for part—not all—of an operative procedure. Use when a physician’s assisting role is limited and does not represent full…- Use CPT modifier -81 when a physician acts as a minimum assistant surgeon who assists during only part (a limited portion) of an operative procedure; append -81 to the primary surgical CPT code to…
    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…

    Showing 1–10 of 12

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RC0000X
    207RH0000X
    2080P0006X
    2084P0800X
    207RP1001X
    225000000X
    2086H0002X
    156FC0801X

    Related ICD-10-CM Codes

    19 rows

    ICD-10-CM CodeDescription
    E11.9Type 2 diabetes mellitus without complications
    E78.5Hyperlipidemia, unspecified
    G45.1Carotid artery syndrome (hemispheric)
    G45.8Other transient cerebral ischemic attacks and related syndromes
    G45.9Transient cerebral ischemic attack, unspecified
    G46.3Brain stem stroke syndrome
    I10Essential (primary) hypertension
    I63.9Cerebral infarction, unspecified
    I65.21Occlusion and stenosis of right carotid artery
    I65.22Occlusion and stenosis of left carotid artery

    Showing 1–10 of 19

    Related Payer Policy Updates

    Specialty: Cardiology1 / 2

    10 rows

    PolicyPayerEffective Date
    Automated Ambulatory Blood Pressure Monitoring for Diagnosis of Hypertension in Patients with Elevated Office Blood PressureBluecross Idaho2026-11-01
    Cardiology - IvabradineCigna2026-10-15
    Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA)univerahealthcare2026-10-15
    Percutaneous Ventricular Assist DeviceUnitedHealthcare2026-10-01
    Cardiovascular Disease Risk AssessmentOscar Health2026-10-01
    Biomarkers for Myocardial Infarction and Chronic Heart FailureOscar Health2026-10-01
    Multiple Procedure Payment Reduction for Diagnostic Cardiovascular ProceduresBlue Cross Blue Shield - Maine2026-10-01
    Left Atrial Appendage Closure Devicesexcellus_health_plan_inc2026-09-17
    Left Atrial Appendage Closure Devicesuniverahealthcare2026-09-17
    Cardiac Omnibus CodesCigna2026-09-15

    Related Codes

    CPT-35500-ARM-VEIN-HARVEST-FOR-BYPASS-CONDUIT

    CPT 35500: Upper Extremity Vein Harvest for Bypass Conduit

    CPT-35501-CAROTID-COMMON-TO-INTERNAL-ARTERY-BYPASS-GRAFT

    CPT 35501: Carotid Bypass, Common to Internal Carotid Artery

    CPT-35506-CAROTID-TO-SUBCLAVIAN-BYPASS-GRAFT

    CPT 35506: Carotid to Subclavian Bypass Graft

    CPT-35508-CAROTID-TO-VERTEBRAL-BYPASS-GRAFT

    CPT 35508: Carotid-to-Vertebral Artery Bypass Graft

    CPT-35510-CAROTID-TO-BRACHIAL-ARTERY-BYPASS-VEIN-GRAFT

    CPT 35510: Carotid-to-Brachial Vein Bypass Graft

    CPT-35511-SUBCLAVIAN-ARTERY-TO-SUBCLAVIAN-ARTERY-VEIN-BYPASS

    CPT 35511: Subclavian-to-Subclavian Vein Bypass Graft

    CPT-35512-SUBCLAVIAN-TO-BRACHIAL-ARTERY-VEIN-BYPASS

    CPT 35512: Subclavian-to-Brachial Artery Bypass with Vein Graft

    CPT-35515-SUBCLAVIAN-TO-VERTEBRAL-ARTERY-BYPASS-VEIN-GRAFT

    CPT 35515: Subclavian to Vertebral Artery Bypass with Vein Graft

    CPT-35516-SUBCLAVIAN-TO-AXILLARY-VEIN-BYPASS

    CPT 35516: Subclavian to Axillary Vein Bypass Graft

    CPT-35518-AXILLARY-ARTERY-TO-AXILLARY-ARTERY-BYPASS-VEIN-GRAFT

    CPT 35518: Axillary-to-Axillary Artery Bypass with Vein Graft

    Showing 1–10 of 32

    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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