CPT code 93893: Transcranial Doppler, venous-arterial shunt detection2026 Medicare rate & RVUs

Medicare pays $365.74 for 93893 nationally in the office.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 93893 covers

93893 represents a transcranial Doppler examination directed at detecting a venous-to-arterial shunt by monitoring intracranial arterial signals. Clinicians may request it when evaluating a suspected right-to-left shunt, including during assessment of otherwise unexplained cerebral ischemia. A vascular laboratory sonographer typically acquires the Doppler data, and a qualified physician interprets the findings in an outpatient or hospital setting. The report should identify the clinical question, vessels monitored, technique, observed signals, and interpretation. A general complete or limited intracranial arterial assessment is a different service.

Select the code that matches the documented service and technique. Code 93898 specifically identifies venous-arterial shunt detection with microbubble injection, so do not assume that protocol from the 93893 descriptor alone. Modifier 26 identifies the professional interpretation, modifier TC identifies the technical service, and billing without a modifier represents the global service. When multiple cardiovascular diagnostic procedures are reported, the CMS multiple-procedure reduction applies to the technical component.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where 93893 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

93893 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the 93893 rate is calculated

Each of 93893’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 93893

The CMS indicators that decide how 93893 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

93893 compared with similar codes

How to choose

93898Shunt detectionIV microbubble injection

93893 identifies venous-arterial shunt detection; 93898 specifically identifies shunt detection with microbubble injection. Match the code to the documented technique.

93892Emboli detectionWithout injection

Choose 93893 for shunt detection and 93892 for intracranial emboli detection without injection.

93886Intracranial DopplerComplete study

93886 describes a complete intracranial arterial Doppler assessment; 93893 is directed at venous-arterial shunt detection.

93888Transcranial DopplerLimited intracranial study

93888 describes a limited intracranial arterial assessment, not the shunt-detection service represented by 93893.

Codes related to 93893

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates