CPT 37600 External Carotid Ligation Reimbursement | OpenPayer

Summary & Overview

CPT 37600: External Carotid Artery Ligation, Neck

CPT code 37600 covers open surgical ligation of the external carotid artery via a neck incision, most commonly performed for carotid artery aneurysm management. This code denotes a definitive vascular procedure that has implications for operative planning, facility resource use, and national surgical volumes for head and neck vascular interventions. It is pertinent for hospitals, independent surgical centers, and payers managing high-acuity vascular cases.

Key payers discussed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of the code’s clinical context, typical settings of care, and common billing considerations. The publication presents payment benchmarks and utilization patterns where available, summaries of relevant policy or coverage guidance that affect claim adjudication, and procedural coding considerations tied to operative documentation.

The report is intended to help billing managers, coders, and health policy analysts understand the clinical intent of CPT code 37600, compare coverage and payment approaches across major payers, and align documentation practices with coding requirements. Data not available in the input is noted when applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare37600CPTvascular surgeryexternal carotid arteryneck surgeryoperating roomaneurysmsurgical ligationprocedure coding

Billing Code Overview

CPT code 37600 describes the surgical incision of the neck to locate and ligate the external carotid artery using a suture or clip. The procedure is most commonly performed to treat a carotid artery aneurysm and involves open vascular surgery of the neck.

Service type: Open surgical vascular procedure
Typical site of service: Inpatient or outpatient hospital operating room (surgical suite)

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient presents with a symptomatic external carotid artery aneurysm discovered after pulsatile mass and localized pain in the neck. Imaging (CT angiography or duplex ultrasound) confirms a focal aneurysmal dilation of the external carotid artery branch with risk of rupture or embolization. The vascular surgeon schedules an operative intervention: a transcervical incision to expose the external carotid artery, control proximal and distal flow, and ligate the artery with suture or surgical clips. The patient is admitted to an acute care hospital or ambulatory surgery center depending on comorbidities and expected anesthesia. Preoperative workflow includes vascular imaging review, informed consent, anesthesia evaluation, and perioperative antibiotics. Intraoperative workflow includes neck incision, careful dissection to identify the external carotid artery and its branches, vessel control, ligation, hemostasis, and wound closure. Postoperative care involves monitoring in the PACU or recovery unit, neurologic and airway assessment, pain control, vascular perfusion checks, and discharge planning with outpatient follow-up and vascular imaging as indicated.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the physician’s professional component if technical component billed separately (rare for operative codes).

CPT 37565: Internal Jugular Vein Ligation for Venous Hum Tinnitus

CPT-37609-TEMPORAL-ARTERY-LIGATION-ANEURYSM-TREATMENT

CPT 37609: Temporal Artery Ligation for Aneurysm Treatment

CPT-37780-SHORT-SAPHENOUS-VEIN-EXCISION-SAPHENOPOPLITEAL-JUNCTION

CPT 37780: Short (Small) Saphenous Vein Excision at Saphenopopliteal Junction

CPT-37606-CAROTID-ARTERY-LIGATION-NECK

CPT 37606: Ligation of Internal or Common Carotid Artery

CPT-37619-INFERIOR-VENA-CAVA-LIGATION-VENOUS-SURGICAL-PROCEDURE

CPT 37619: Inferior Vena Cava Ligation to Narrow Vessel Diameter

CPT-37618-LIGATION-RUPTURED-LIMB-ARTERY-TRAUMA

CPT 37618: Ligation of Ruptured Limb Artery

CPT-37722-GREAT-SAPHENOUS-VEIN-STRIPPING-VARICOSE-VEINS

CPT 37722: Great Saphenous Vein Stripping for Varicose Veins

CPT-37785-VARICOSE-VEIN-CLUSTER-EXCISION

CPT 37785: Excision of Cluster of Varicose Veins

CPT-37760-LIGATION-EXCISION-PERFORATOR-VEIN-VARICOSE-VEIN-SURGERY

CPT 37760: Ligation and Excision of Perforator Vein for Varicose Veins

CPT-37765-AMBULATORY-MICROPHLEBECTOMY-VARICOSE-VEIN-EXCISION

CPT 37765: Ambulatory Microphlebectomy for Varicose Veins

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Taxonomy Code	Specialty	Notes
208BF0000X	Vascular Surgery	Primary specialty performing extracranial carotid and external carotid artery operations.
207K00000X	Otolaryngology (ENT)	May perform neck dissections and vascular control in head and neck aneurysm cases.
207P00000X	General Surgery	Surgeons with vascular experience may perform ligation in relevant clinical settings.
207L00000X	Thoracic Surgery	May be involved when concurrent neck or proximal great vessel exposure is required.
2080P0002X	Interventional Cardiology	Rarely involved for hybrid or endovascular-assisted approaches; typically not primary for open ligation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I72.3`	Aneurysm of other arteries of head and neck	Directly relevant — identifies aneurysmal disease of the external carotid or its branches prompting ligation.
`I72.8`	Aneurysm of other specified arteries	Relevant for arterial aneurysms in head/neck region when unspecified vessel classification is used.
`I72.9`	Aneurysm of artery, unspecified	Used when documentation does not specify the exact arterial location but aneurysm management performed.
`I77.9`	Disorder of arteries and arterioles, unspecified	Used for non-specific arterial pathology when exact diagnosis is not coded.
`S15.8XXA`	Other injury of blood vessels at neck level, initial encounter	Relevant when external carotid injury from trauma requires ligation.
`I65.29`	Occlusion and stenosis of other carotid artery	Relevant when severe occlusive disease of external carotid branches leads to surgical management such as ligation.
`I71.3`	Thoracic aortic aneurysm, ruptured	Not a direct match but included in differential vascular aneurysm coding for complex patients requiring vascular surgical care.
`R07.9`	Chest pain, unspecified	Symptom code that may appear in initial presentation; less specific but sometimes present in vascular workups.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`37241`	Vascular embolization or occlusion, inclusive of all radiological supervision and interpretation; for example, therapeutic embolization procedures of head and neck vessels	Alternative or adjunct when endovascular occlusion of the external carotid artery branches is performed instead of open ligation or as preoperative embolization to reduce intraoperative bleeding.
`35800`	Excision of vessel with anastomosis; other than coronary, thoracic aorta or portal veins (e.g., resection and repair of arterial lesion)	Performed when aneurysm requires resection and arterial repair rather than simple ligation.
`36010`	Introduction of needle or catheter into superficial vessel, for diagnostic purposes (e.g., arteriography)	May be performed preoperatively for diagnostic angiography to delineate vascular anatomy.
`31276`	Balloon dilation, transluminal (e.g., endonasal or intracranial) (Note: head/neck endovascular interventions)	Represents endovascular interventions that can be performed in hybrid cases; included when endovascular approaches are considered in the workflow.
`13160`	Secondary repair of large wound of face, scalp, eyelids, nose, ears; may apply to complex neck soft tissue closure	Used when complex wound closure or flap coverage is necessary after extensive neck dissection.

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