Summary & Overview

CPT 37257: Iliac Angioplasty for Complex Lesion in Additional Vessel

CPT code 37257 identifies angioplasty of a complex iliac lesion performed at the same session as an initial iliac revascularization. It covers balloon expansion of a complete occlusion or other complex narrowing in an additional iliac vessel, and includes access, catheterization, lesion crossing, and imaging guidance. The code is used across acute and ambulatory vascular settings and has significance for procedural coding, reimbursement sequencing, and clinical documentation when multiple iliac interventions occur in a single session.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a national-level summary of the code's clinical intent, typical sites of service, and payer coverage context. The publication also outlines benchmarking and policy-relevant considerations for hospitals and ambulatory surgical centers, along with clinical context that clarifies when use of the code aligns with a complex additional-vessel angioplasty performed during an initial iliac revascularization session.

This summary is intended for coding professionals, billing managers, and vascular specialists who need a concise reference to CPT code 37257 and its role in multi-vessel iliac revascularization procedures.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare37257CPTiliac-angioplastyendovascularvascular-surgeryangioplastyinterventional-radiologyhospital-outpatient

Billing Code Overview

CPT code 37257 describes an angioplasty procedure performed during the same session as an initial iliac revascularization service. The service is the balloon expansion of a complex lesion (such as a complete occlusion) in an additional vessel within the iliac vascular territory, which includes the common iliac, internal iliac, and external iliac arteries. The code includes all access, catheterization, lesion crossing, and imaging guidance required to complete the angioplasty.

Service Type: Endovascular iliac angioplasty for complex lesion (adjunctive/secondary vessel)

Typical Site of Service: Hospital inpatient, hospital outpatient, or ambulatory surgical center

Clinical & Coding Specifications

Clinical Context

A 72-year-old man with a history of peripheral arterial disease, hypertension, and smoking presents with worsening right lower-extremity claudication and diminished ankle-brachial index. Noninvasive testing and CT angiography show a significant stenosis in the right common iliac artery and a separate chronic total occlusion of the ipsilateral external iliac artery. The vascular interventional team plans an initial iliac revascularization service with stent placement to treat the primary lesion. During the same operative session, after establishing vascular access and performing angiography, the interventionalist performs balloon angioplasty of the additional complex occluded iliac vessel to restore inline flow.

The clinical workflow includes pre-procedure evaluation and informed consent, vascular access (percutaneous or open), diagnostic angiography, lesion crossing techniques for the occluded segment, balloon angioplasty of the additional complex lesion, adjunctive imaging (fluoroscopy and digital subtraction angiography), hemostasis, and post-procedure monitoring in a recovery area or vascular observation unit. Typical personnel include an interventional vascular surgeon or interventional radiologist, technologists, nursing staff, and anesthesia as required. Typical sites of service are hospital inpatient, hospital outpatient (ambulatory surgery center within hospital), or freestanding ambulatory surgical center, depending on patient comorbidities and institutional capabilities.

Coding Specifications

Modifier	Description	When to Use
`25`	Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure

Taxonomy Code	Specialty	Notes
`208100000X`	Vascular Surgery	Common performing specialty for iliac revascularization and complex iliac angioplasty.

ICD-10 Code	Description	Clinical Relevance
`I70.209`	Unspecified atherosclerosis of native arteries of the extremities, unspecified extremity	Common underlying cause of iliac stenosis or occlusion leading to need for angioplasty.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`37254`	Transcatheter placement of intravascular stent(s), iliac artery, unilateral, with angioplasty when performed; initial vessel	Often reported for the primary iliac stent placement during the same session; `37257` is reported for angioplasty of an additional complex occluded iliac vessel at the same session.

| 37258 | Transcatheter placement of intravascular stent(s), iliac artery, bilateral, with angioplasty when performed; initial vessel(s) | Used when bilateral iliac stenting is performed; may be part of the overall iliac revascularization strategy.

| 36011 | Introduction of needle or intracatheter, arterial, for diagnostic purposes, without radiological supervision and interpretation, not elsewhere classified | Represents arterial access techniques; diagnostic arterial access and catheter placement are components of iliac interventions and may be reported when separately payable per payer rules.

| 93580 | Catheter introduction for diagnostic angiography, peripheral arterial, with imaging supervision and interpretation; iliac/celiac/mesenteric or extremity vessels | Represents diagnostic peripheral angiography of the iliac vessels that commonly precedes therapeutic iliac angioplasty/stenting.

| 37246 | Revascularization, endovascular, open or percutaneous, including angioplasty, atherectomy, and/or stent, any vascular family, initial vessel | May be used in some coding scenarios for peripheral endovascular revascularization when code sets are grouped; selection depends on exact vessel and payer guidance.

| 76937 | Ultrasound guidance for vascular access | Used when ultrasound guidance is employed for vascular access during percutaneous iliac interventions.

| 36415 | Collection of venous blood by venipuncture | Represents common ancillary services for pre- and intra-procedural labs; billed separately when applicable.

| 99024 | Postoperative follow-up visit, during a global period, related to the original procedure | Used for routine post-op visits during the global period; documentation must support routine nature.

| 92973 | Transcatheter therapy, not otherwise specified (for noncoronary vascular beds) | Rarely used; include only per coding guidance when no specific code applies.

| 77012 | Computed tomography guidance for diagnostic, surveillance, or therapeutic procedures (list separately in addition to primary procedure) | Used when CT guidance is used for lesion localization or crossing adjunctively during complex iliac interventions.

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