93880
Duplex scan of extracranial arteries; complete bilateral study
CPT code 93880 describes a complete bilateral duplex scan of the extracranial arteries. This non-invasive ultrasound procedure involves the use of both B-mode imaging (to visualize the vessel structure, plaque, and intimal-medial thickness) and pulsed Doppler spectral analysis (to evaluate blood flow velocity, direction, and characteristics) of the carotid and vertebral arteries in the neck. The study is performed to assess the patency, morphology, and hemodynamics of these vessels, primarily to detect and quantify stenosis, occlusion, aneurysm, dissection, or other vascular abnormalities that may lead to cerebrovascular disease.
Clinical Indications
- Transient Ischemic Attack (TIA)
- Stroke or suspected stroke (ischemic or embolic)
- Asymptomatic carotid bruit
- Amaurosis fugax
- Syncope or dizziness potentially related to vertebrobasilar insufficiency
- Follow-up after carotid endarterectomy or stenting
- Preoperative assessment for major cardiovascular surgery (e.g., CABG, valve replacement) in patients with risk factors for cerebrovascular disease
- Known peripheral arterial disease or coronary artery disease indicating generalized atherosclerosis
- Pulsatile neck mass suggesting aneurysm or pseudoaneurysm
- Evaluation of suspected carotid artery dissection following trauma or spontaneous event
Procedure Steps
- Patient positioned supine with neck slightly extended and head turned away from the side being examined.
- Ultrasound gel applied to the neck over the carotid and vertebral artery pathways.
- B-mode imaging used to identify common carotid artery (CCA), internal carotid artery (ICA), external carotid artery (ECA), and vertebral arteries.
- Vessel lumen, wall thickness, and presence/character of atherosclerotic plaque assessed.
- Doppler spectral analysis performed at multiple segments of each vessel (e.g., proximal, mid, distal CCA; bulb; proximal, mid, distal ICA; ECA; vertebral arteries).
- Peak systolic velocity (PSV) and end-diastolic velocity (EDV) measurements obtained.
- Ratio calculations (e.g., ICA/CCA ratio) performed to quantify stenosis.
- Documentation of flow characteristics, direction, and presence of turbulence or post-stenotic jets.
- Image acquisition and storage for interpretation and reporting.
Coding Guidelines
- CPT 93880 represents a complete bilateral study. If only one side is studied, or if the study is incomplete, CPT 93882 (Duplex scan of extracranial arteries; unilateral or limited study) should be used.
- This code includes both real-time B-mode imaging and pulsed Doppler spectral analysis. Do not report separately for these components.
- Appropriate documentation must support the medical necessity for a complete bilateral study. Unilateral symptoms may warrant a complete bilateral study if clinically indicated (e.g., assessing the contralateral side for baseline or compensatory flow).
- Do not report 93880 in conjunction with codes for transcranial Doppler (TCD) studies (93886, 93888) when performed on the same date unless distinct clinical indications for each study are documented.
- Professional (26 modifier) and technical (TC modifier) components should be appended when the service is split between different entities or providers.