Summary & Overview
CPT 93898: Intracranial Doppler with Microbubble for Shunt Detection
CPT code 93898 describes an add-on diagnostic Doppler ultrasound procedure that uses an injected microbubble contrast agent to detect venous–arterial shunts within the intracranial circulation. As an adjunct to a complete intracranial arterial Doppler study, the service enhances detection of abnormal vascular connections that can have clinical implications for stroke evaluation, paradoxical embolism assessment, and other neurovascular workups. Nationally, this code matters for providers who perform advanced neurovascular ultrasound and for payers overseeing imaging utilization and prior authorization policies.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for using microbubble-enhanced intracranial Doppler, coding and billing considerations for an add-on service, payer coverage patterns, and typical sites of service. The publication summarizes benchmarks where available, highlights relevant policy and coverage update themes, and outlines factors that influence utilization and documentation needs for accurate claims submission.
This briefing is written for a national audience of clinicians, coding professionals, and policy analysts seeking a concise reference on CPT code 93898 and its role in neurovascular diagnostic pathways.
Billing Code Overview
CPT code 93898 is an add-on Doppler ultrasound procedure performed after a complete Doppler study of the intracranial arteries. During the service the provider injects an ultrasound contrast microbubble agent and conducts targeted Doppler monitoring to detect a venous–arterial shunt, an abnormal connection allowing venous blood to pass into the arterial circulation.
Service type: Diagnostic vascular ultrasound with contrast (add-on)
Typical site of service: Hospital outpatient department or vascular laboratory / radiology suite
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient presents to the neurovascular laboratory with a history of cryptogenic ischemic stroke and suspected right-to-left shunt after prior transthoracic echocardiography was inconclusive. The patient is scheduled for a complete transcranial Doppler (TCD) ultrasound of the intracranial arteries with contrast-enhanced microbubble injection to detect a venous–arterial (right-to-left) shunt such as a patent foramen ovale or pulmonary arteriovenous malformation. The clinical workflow includes pre-procedure screening for contraindications to the ultrasound contrast agent, informed consent, baseline TCD acoustic windows and waveform assessment, peripheral intravenous access placement, administration of agitated saline or approved ultrasound contrast microbubbles, and monitoring for appearance of microbubbles in the middle cerebral artery or other intracranial vessels. The procedure is performed as an add-on to the complete Doppler study when the sonographer and interpreting physician actively search for shunt by observing microbubble passage during rest and with provocative maneuvers (Valsalva). Typical site of service is an outpatient vascular laboratory, hospital radiology or neurology department, or ambulatory surgery center capable of transcranial Doppler testing and intravenous contrast administration. Patient monitoring continues for a short period after injection and the interpreting neurosonologist documents timing and grade of microbubble appearance and any complications.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component |