CPT code 93978 denotes a complete duplex Doppler ultrasound study of the aorta, inferior vena cava (IVC), iliac vessels, or vascular bypass grafts. This imaging code captures a comprehensive vascular assessment combining grayscale and Doppler evaluation to detect stenosis, occlusion, aneurysm, graft patency, and other hemodynamic abnormalities. It is widely used across hospital outpatient departments, dedicated vascular laboratories, and freestanding imaging centers and plays a key role in noninvasive vascular diagnosis and postoperative surveillance.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a focused overview of clinical indications and the typical settings for use, plus benchmarking context where payer coverage patterns and coding practice matter for utilization and claims adjudication. The publication summarizes common modifiers and administrative considerations, highlights typical related service lines, and outlines what to expect for documentation and claim substantiation. National payers and Medicare policy approaches to vascular ultrasound coding affect payment, preauthorization, and allowed services; this document provides the clinical and billing context necessary for operational and policy audiences. Data not available in the input is noted where applicable.