CPT code 93931 denotes a unilateral duplex ultrasound of the upper extremity arteries or bypass grafts — a noninvasive vascular imaging test used to measure blood flow and identify arterial stenosis or occlusion in one arm. This procedure is commonly performed in outpatient vascular labs, hospital outpatient departments, and ambulatory imaging centers and is an important diagnostic tool for patients with suspected upper extremity arterial disease, thrombotic complications of bypass grafts, or embolic symptoms.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of service definitions, typical sites of service, and the clinical context in which 93931 is used. The publication summarizes standard billing considerations and common modifiers provided in the input, and outlines where this service sits within vascular diagnostic care pathways.

This national summary is intended to help billing managers, vascular lab directors, and policy analysts understand what CPT code 93931 represents, how it is applied clinically, and which payers typically reimburse for unilateral upper extremity arterial duplex exams. Data not available in the input is noted where applicable.