CPT code 93571 is an add-on code for intravascular physiologic assessment performed during coronary angiography, representing the initial vessel in which blood flow and pressure are measured using a Doppler or pressure wire. This physiologic testing — which can include pharmacologic stress to increase coronary flow — provides objective data to guide coronary lesion assessment and revascularization strategy. Nationally, such physiologic assessments affect procedural decision-making, utilization patterns, and reimbursement for interventional cardiology services.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical service and typical sites of care, plus practical information on common billing modifiers and related service coding where available. The publication summarizes benchmarks and coverage considerations relevant to this add-on CPT code, outlines the clinical context for physiologic coronary assessment, and highlights implications for coding and billing workflows. The material is intended for coding professionals, hospital and ambulatory procedure administrators, and clinicians involved in cardiac catheterization services.