Summary & Overview

CPT 93979: Limited Duplex Vascular Ultrasound for Aorta, IVC, Iliac, or Graft

CPT code 93979 represents a limited duplex Doppler ultrasound study focused on specific vascular territories — the aorta, inferior vena cava (IVC), iliac vessels, or bypass grafts — or a unilateral exam. Nationally, this code matters for tracking use of targeted vascular imaging when a full bilateral or comprehensive study is not required, supporting follow-up of grafts and focal vascular concerns while reducing procedure time and resources compared with comprehensive exams. Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find a concise overview of the clinical context for limited duplex vascular studies, how CPT code 93979 is used in common care pathways (graft surveillance, evaluation of focal vascular symptoms), and operational implications for imaging sites of service. The publication summarizes payer coverage patterns and reimbursement benchmarks where available, highlights coding and documentation considerations tied to limited versus comprehensive vascular duplex exams, and outlines relevant trends in utilization and payer policy updates. Data not available in the input is noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare93979CPTvascular ultrasoundduplex DoppleraortaIVCiliac vasculaturebypass graft surveillanceimaging

Billing Code Overview

CPT code 93979 describes a limited duplex Doppler ultrasound study of vascular structures, performed to assess vascular abnormalities or to follow up on previously placed bypass grafts. The study may target the aorta, the inferior vena cava (IVC), the iliac vasculature, bypass grafts, or may be limited to one side. The focus is on using duplex ultrasound techniques to visualize flow and structure in a confined anatomic region.

Service Type: Limited duplex Doppler ultrasound vascular study

Typical Site of Service: Hospital outpatient imaging departments, freestanding vascular laboratories, and ambulatory surgical centers

Clinical & Coding Specifications

Clinical Context

A 68-year-old patient with a history of peripheral arterial disease and prior femoral–popliteal bypass presents to the vascular laboratory for a focused duplex Doppler ultrasound. The referral requests evaluation for suspected graft stenosis due to worsening claudication and diminished distal pulses over several weeks. The sonographer performs a limited duplex study of the bypass graft and ipsilateral iliac/femoral inflow to assess for elevated peak systolic velocities, focal turbulence, or graft occlusion. The interpreting vascular physician reviews real-time images and Doppler waveforms, documents peak velocities, waveform morphology, and any focal defects, and provides a focused report. This limited study excludes a comprehensive bilateral arterial exam and targets the aorta, inferior vena cava, single-side iliac/femoral arterial segment, or a single bypass graft as indicated.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When billing separate physician interpretation/reporting of the duplex study (technical performed by facility or sonographer).
`TC`	Technical component	When billing only the technical portion (equipment, sonographer) and physician interpretation billed separately.

Taxonomy Code	Specialty	Notes
207RC0000X	Vascular Surgery	Primary specialty performing vascular duplex interpretation and procedures.
207RI0200X	Interventional Cardiology	Performs and interprets vascular imaging in patients undergoing endovascular procedures.
2080P0005X	Diagnostic Radiology	Interprets vascular ultrasound studies in hospital imaging departments.
207K00000X	General Surgery	May manage bypass grafts and obtain focused duplex surveillance.
207RH0000X	Hematology/Oncology (vascular access focus)	Occasionally involved when access graft evaluation is needed.

ICD-10 Code	Description	Clinical Relevance
`I70.2`	Atherosclerosis of native arteries of the extremities	Common cause of peripheral arterial disease prompting limited arterial or graft duplex to evaluate stenosis.
`I74.3`	Embolism and thrombosis of arteries of lower extremity	Suspected acute occlusion or thrombosis of a bypass graft or native artery may prompt focused duplex study.
`I77.1`	Stricture of artery	Evaluation for focal arterial stenosis or graft narrowing uses duplex velocimetry.
`I71.3`	Abdominal aortic aneurysm, ruptured or without rupture (specifics vary)	Focused aortic duplex may assess aneurysm extent or graft inflow when related to peripheral bypass planning.
`Z95.2`	Presence of prosthetic heart valve (placeholder for device presence)	Included when vascular graft surveillance and presence of vascular prosthetic material are relevant (note: device codes vary by site).

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`93971`	Duplex scan of extremity veins including responses to compression and distal augmentation; complete bilateral study	May be ordered when venous pathology is suspected alongside arterial/graft evaluation; complementary but distinct from arterial/graft limited study.
`93970`	Duplex scan of extremity veins including responses to compression and distal augmentation; limited or follow-up study	May be used for a focused venous evaluation when a targeted venous exam is needed the same day.
`93925`	Duplex scan of abdominal arteries (e.g., renal, mesenteric); single or limited study	Used when evaluation of abdominal arterial inflow (aorta or iliac origin) is required in conjunction with limited graft or iliac artery duplex.
`93975`	Duplex scan of arterial inflow and outflow, single extremity or follow-up study	Often used in combination when a more complete peripheral arterial duplex is indicated beyond the limited single-target exam.
`76536`	Ultrasound, abdominal, real time with image documentation; limited	May be used when assessment of the abdominal aorta (aneurysm or proximal inflow) is required in conjunction with the limited vascular duplex.

OpenPayer