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CPT 36473: Image-Guided Mechanochemical Ablation for Varicose Vein, First Vein

Headline: CPT code 36473 Defines Image-Guided Mechanochemical Ablation for Varicose Veins

Lead: CPT code 36473 covers percutaneous, image-guided mechanochemical ablation (MOCA) of an extremity vein, reported for the treatment of the first vein treated. The code captures a minimally invasive endovenous approach that combines mechanical disruption with chemical ablation to treat incompetent saphenous and other superficial veins.

CPT code 36473 matters nationally because MOCA represents a growing alternative to thermal ablation and surgical stripping for symptomatic varicose veins, influencing outpatient procedural volumes and payer coverage policies. Major payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn the clinical context of the procedure, the typical sites of service, and what this code represents for coding and billing workflows. The publication summarizes national benchmarks and reimbursement patterns where available, outlines common payer coverage considerations, and highlights relevant clinical and policy developments affecting utilization of mechanochemical ablation. Data not available in the input will be noted where applicable.

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Billing Code Overview

CPT code 36473 describes percutaneous mechanochemical ablation (MOCA) performed under imaging guidance and monitoring to destroy the intimal lining of a vein in an extremity for treatment of incompetent (varicose) veins. The code is reported for the treatment of the first vein using a specially designed MOCA device inserted through a catheter placed through the skin.

Service type: Image-guided percutaneous mechanochemical ablation (endovenous venous ablation)
Typical site of service: Outpatient vascular procedure setting or ambulatory surgery center; may also be performed in hospital outpatient departments.

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CPT 36473: Image-Guided Mechanochemical Ablation for Varicose Vein, First Vein

Headline: CPT code 36473 Defines Image-Guided Mechanochemical Ablation for Varicose Veins

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Billing Code Overview

Service type: Image-guided percutaneous mechanochemical ablation (endovenous venous ablation)
Typical site of service: Outpatient vascular procedure setting or ambulatory surgery center; may also be performed in hospital outpatient departments.

Clinical & Coding Specifications

Clinical Context

A 56-year-old ambulatory patient presents to an outpatient vascular clinic with symptomatic varicose veins of the right great saphenous vein characterized by aching, swelling, and visible tributary veins. Duplex ultrasound confirms reflux of the great saphenous vein. The provider obtains informed consent and schedules an image-guided mechanochemical ablation (MOCA) session. On the day of service the patient arrives to an ambulatory surgical center. Under ultrasound guidance, local tumescent anesthesia is administered percutaneously, a catheter is inserted into the target saphenous vein, and a commercially available MOCA device is advanced to the treatment segment. The device mechanically disrupts the endothelium while a sclerosant is delivered, resulting in chemical and mechanical ablation of the incompetent vein. Post-procedure duplex ultrasound confirms closure of the treated segment; the patient is discharged with compression stockings and follow-up arranged in 1–2 weeks.

Coding Specifications

Modifier	Description	When to Use
`00`	Standard primary or default service indicator	Rarely used explicitly; indicates standard service when payer requires a two-character code for reporting primary service.
`11`	Default standard of care (CMS does not define `11` universally; used by some payers for primary procedure)	Used when submitting as the primary, uncomplicated MOCA procedure under payer rules that recognize `11`.
`22`	Increased procedural services	Use when the procedure required significantly more work or time than typical (extensive additional dissection, prolonged procedure time).
`23`	Unusual anesthesia	Use if general anesthesia or an unusual anesthetic was required instead of typical local/tumescent anesthesia.
`50`	Bilateral procedure	Apply when MOCA is performed on both left and right extremities and payer requires bilateral modifier reporting.
`51`	Multiple procedures	Use when MOCA is reported along with other distinct procedural codes on the same date of service.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned.
`53`	Discontinued procedure	Use if the MOCA procedure was started but then terminated for patient safety reasons prior to completion.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of the procedure.
`78`	Unplanned return to the operating/procedure room for a related procedure by the same physician	Use if patient returns urgently to address a complication related to the initial MOCA within the global period.
`80`	Assistant surgeon	Use when a surgical assistant (not a co-surgeon) is required and payer accepts the assistant surgeon modifier.
`81`	Minimum assistant surgeon	Use when minimal assistance is documented and payer recognizes this modifier.
`82`	Assistant not available; trainee or physician assistant performed	Use when a qualified assistant surgeon is not available and an unqualified resident or other allowed provider assists.
`LT`	Left side	Use to designate a left extremity treatment when laterality is required by the payer.
`RT`	Right side	Use to designate a right extremity treatment when laterality is required by the payer.

Taxonomy Code	Specialty	Notes
207R00000X	Vascular Surgery	Common specialty performing endovenous and mechanochemical ablation procedures.
2080P0003X	Interventional Cardiology	Interventionalists who perform peripheral venous interventions in some settings.
2086S0122X	Phlebology	Specialists focused on venous disease and minimally invasive venous procedures.
207K00000X	General Surgery	General surgeons with vascular or endovascular expertise who perform venous ablation.
222100000X	Physician Assistant	Frequently assist in perioperative care and may perform parts of the procedure under supervision per state law.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I83.011`	Varicose veins of right lower extremity with ulcer of thigh	Advanced varicose disease with ulceration indicating venous incompetence amenable to ablation therapy of involved trunks.
`I83.012`	Varicose veins of left lower extremity with ulcer of thigh	Same as above for the left side; guides laterality and severity for treatment planning.
`I83.20`	Varicose veins of unspecified lower extremity with pain	Symptomatic varicose veins where MOCA addresses the underlying reflux causing pain.
`I83.819`	Varicose veins of unspecified lower extremity with other complications	Captures varicose veins with complications (e.g., edema, inflammation) relevant to procedural indication.
`I87.2`	Venous insufficiency (chronic) (peripheral)	Chronic venous insufficiency is the pathophysiologic indication for endovenous ablation procedures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36473`	Under imaging guidance and monitoring, insertion of mechanochemical ablation (MOCA) device; report for treatment of the first vein.	Primary code for percutaneous MOCA of the first treated vein.
`36474`	Under imaging guidance and monitoring, insertion of mechanochemical ablation (MOCA) device; each additional vein, when reported separately as an add-on.	Use when additional separate veins are treated during the same session (add-on to `36473`).
`76881`	Ultrasound, extremity, nonvascular, real-time with image documentation, complete.	May be used for pre- or post-procedure extremity ultrasound when documented as a separate service.
`93970`	Duplex scan of extremity veins including responses to compression and other provocative maneuvers; complete bilateral study.	Pre-procedure venous mapping and reflux assessment; diagnostic confirmation prior to MOCA.
`36478`	Endovenous ablation therapy of incompetent vein, extremity, by catheter-based chemical ablation; first vein treated.	Alternative endovenous ablation technique (chemical) that may be performed instead of MOCA; relevant for coding comparisons.

CPT 36474: Mechanochemical Ablation of Additional Incompetent Vein(s)

CPT-36475-ENDOVENOUS-RADIOFREQUENCY-ABLATION-VEIN-DESTRUCTION-EXTREMITY

CPT 36475: Endovenous Radiofrequency Ablation of Extremity Vein

CPT-36476-ENDOVENOUS-RADIOFREQUENCY-ABLATION-ADD-ON

CPT 36476: Endovenous Radiofrequency Ablation, Additional Vein

CPT-36478-ENDOVENOUS-LASER-ABLATION-FIRST-VEIN

CPT 36478: Endovenous Laser Ablation of First Diseased Vein

CPT-36479-ENDOVENOUS-LASER-ABLATION-ADD-ON-PROCEDURE

CPT 36479: Endovenous Laser Ablation, Additional Vein

CPT-36483-ADD-ON-CHEMICAL-ADHESIVE-ABLATION-EXTREMITY

CPT 36483: Add-On Chemical Adhesive Ablation of Subsequent Extremity Veins

References

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.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.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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Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`00`	Standard primary or default service indicator	Rarely used explicitly; indicates standard service when payer requires a two-character code for reporting primary service.
`11`	Default standard of care (CMS does not define `11` universally; used by some payers for primary procedure)	Used when submitting as the primary, uncomplicated MOCA procedure under payer rules that recognize `11`.
`22`	Increased procedural services	Use when the procedure required significantly more work or time than typical (extensive additional dissection, prolonged procedure time).
`23`	Unusual anesthesia	Use if general anesthesia or an unusual anesthetic was required instead of typical local/tumescent anesthesia.
`50`	Bilateral procedure	Apply when MOCA is performed on both left and right extremities and payer requires bilateral modifier reporting.
`51`	Multiple procedures	Use when MOCA is reported along with other distinct procedural codes on the same date of service.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned.
`53`	Discontinued procedure	Use if the MOCA procedure was started but then terminated for patient safety reasons prior to completion.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of the procedure.
`78`	Unplanned return to the operating/procedure room for a related procedure by the same physician	Use if patient returns urgently to address a complication related to the initial MOCA within the global period.
`80`	Assistant surgeon	Use when a surgical assistant (not a co-surgeon) is required and payer accepts the assistant surgeon modifier.
`81`	Minimum assistant surgeon	Use when minimal assistance is documented and payer recognizes this modifier.
`82`	Assistant not available; trainee or physician assistant performed	Use when a qualified assistant surgeon is not available and an unqualified resident or other allowed provider assists.
`LT`	Left side	Use to designate a left extremity treatment when laterality is required by the payer.
`RT`	Right side	Use to designate a right extremity treatment when laterality is required by the payer.

Taxonomy Code	Specialty	Notes
207R00000X	Vascular Surgery	Common specialty performing endovenous and mechanochemical ablation procedures.
2080P0003X	Interventional Cardiology	Interventionalists who perform peripheral venous interventions in some settings.
2086S0122X	Phlebology	Specialists focused on venous disease and minimally invasive venous procedures.
207K00000X	General Surgery	General surgeons with vascular or endovascular expertise who perform venous ablation.
222100000X	Physician Assistant	Frequently assist in perioperative care and may perform parts of the procedure under supervision per state law.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I83.011`	Varicose veins of right lower extremity with ulcer of thigh	Advanced varicose disease with ulceration indicating venous incompetence amenable to ablation therapy of involved trunks.
`I83.012`	Varicose veins of left lower extremity with ulcer of thigh	Same as above for the left side; guides laterality and severity for treatment planning.
`I83.20`	Varicose veins of unspecified lower extremity with pain	Symptomatic varicose veins where MOCA addresses the underlying reflux causing pain.
`I83.819`	Varicose veins of unspecified lower extremity with other complications	Captures varicose veins with complications (e.g., edema, inflammation) relevant to procedural indication.
`I87.2`	Venous insufficiency (chronic) (peripheral)	Chronic venous insufficiency is the pathophysiologic indication for endovenous ablation procedures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36473`	Under imaging guidance and monitoring, insertion of mechanochemical ablation (MOCA) device; report for treatment of the first vein.	Primary code for percutaneous MOCA of the first treated vein.
`36474`	Under imaging guidance and monitoring, insertion of mechanochemical ablation (MOCA) device; each additional vein, when reported separately as an add-on.	Use when additional separate veins are treated during the same session (add-on to `36473`).
`76881`	Ultrasound, extremity, nonvascular, real-time with image documentation, complete.	May be used for pre- or post-procedure extremity ultrasound when documented as a separate service.
`93970`	Duplex scan of extremity veins including responses to compression and other provocative maneuvers; complete bilateral study.	Pre-procedure venous mapping and reflux assessment; diagnostic confirmation prior to MOCA.
`36478`	Endovenous ablation therapy of incompetent vein, extremity, by catheter-based chemical ablation; first vein treated.	Alternative endovenous ablation technique (chemical) that may be performed instead of MOCA; relevant for coding comparisons.

CPT 36474: Mechanochemical Ablation of Additional Incompetent Vein(s)

CPT-36475-ENDOVENOUS-RADIOFREQUENCY-ABLATION-VEIN-DESTRUCTION-EXTREMITY

CPT 36475: Endovenous Radiofrequency Ablation of Extremity Vein

CPT-36476-ENDOVENOUS-RADIOFREQUENCY-ABLATION-ADD-ON

CPT 36476: Endovenous Radiofrequency Ablation, Additional Vein

CPT-36478-ENDOVENOUS-LASER-ABLATION-FIRST-VEIN

CPT 36478: Endovenous Laser Ablation of First Diseased Vein

CPT-36479-ENDOVENOUS-LASER-ABLATION-ADD-ON-PROCEDURE

CPT 36479: Endovenous Laser Ablation, Additional Vein

CPT-36483-ADD-ON-CHEMICAL-ADHESIVE-ABLATION-EXTREMITY

CPT 36483: Add-On Chemical Adhesive Ablation of Subsequent Extremity Veins

References

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.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.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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Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 36473: Image-Guided Mechanochemical Ablation for Varicose Vein, First Vein

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Billing Code Overview

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CPT 36473: Image-Guided Mechanochemical Ablation for Varicose Vein, First Vein

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References