Summary & Overview
CPT 93924: Exercise-Based Leg Arterial Blood Flow Assessment
CPT code 93924 covers noninvasive vascular testing that measures arterial blood flow in the legs before and after exercise, using techniques such as bidirectional Doppler waveform analysis, volume plethysmography, and ankle-brachial index measurement. This evaluation is used to detect peripheral arterial occlusive disease and to assess changes in perfusion related to exertion. Nationally, this code matters because peripheral arterial disease affects a sizeable patient population and exercise-based vascular assessments guide diagnosis and management decisions across outpatient and hospital settings.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of the clinical purpose of the code, typical sites of service, common billing modifiers (listed separately), and how the service fits into vascular diagnostic pathways. The publication summarizes benchmarks for utilization and coverage patterns where available, clarifies documentation and service expectations tied to this code, and situates 93924 alongside related vascular testing services for clinical context.
This summary is intended for billing managers, vascular laboratory leaders, and policy analysts seeking a clear national-level overview of what CPT code 93924 represents, how it is used clinically, and which major payers commonly cover the service. Data not available in the input is identified where relevant.
Billing Code Overview
CPT code 93924 describes a post-exercise assessment of arterial blood flow in the legs. The provider evaluates blood flow before and after exercise using techniques such as bidirectional Doppler waveform analysis, volume plethysmography, and ankle-brachial index measurement. The assessment includes monitoring symptoms and exercise tolerance to help identify peripheral arterial occlusive disease and to evaluate circulatory response to exertion.
Service type: Noninvasive vascular diagnostic testing with exercise challenge
Typical site of service: Outpatient vascular laboratory, hospital outpatient department, or clinic-based vascular testing unit
Clinical & Coding Specifications
Clinical Context
A 67-year-old man with a history of long-standing peripheral arterial disease and exertional calf pain presents to a vascular laboratory for evaluation of lower extremity arterial perfusion. He reports worsening claudication after walking 50–100 meters. The vascular technologist obtains baseline ankle-brachial indices (ABIs) using Doppler and sphygmomanometer measurements, records segmental limb pressures, and performs plethysmography and bidirectional Doppler waveform analysis. The provider then has the patient perform treadmill exercise to reproduce symptoms while continuously monitoring ankle pressures and Doppler waveforms, and documents post-exercise ABIs and waveform changes to assess for exercise-induced arterial insufficiency. The clinical workflow includes pre-test screening for contraindications, obtaining informed consent, instrument calibration, baseline studies, supervised exercise testing, immediate post-exercise measurements, interpretation by a qualified vascular specialist, and documentation of findings and recommended next steps (such as referral for arterial imaging or vascular surgery consultation). Typical site of service is an outpatient vascular laboratory, vascular surgery clinic, or hospital-based diagnostic imaging suite. The service type is diagnostic vascular physiology testing focused on lower extremity arterial blood flow assessment before and after exercise.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when only the physician interpretation/report is billed separate from technical component. |