CPT code 01933: Intracranial intervention, therapeutic radiology procedures2026 Medicare rate & RVUs

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

What 01933 covers

This service covers anesthesia for therapeutic interventional radiology procedures directed to the intracranial compartment. A typical case is endovascular treatment of an intracranial aneurysm. An anesthesiologist or CRNA provides the anesthetic care in a facility while the interventional radiologist performs the procedure; the anesthesia claim represents the anesthesia service, not the radiologic intervention itself.

Choose this code for therapeutic intracranial intervention rather than anesthesia for diagnostic imaging or a procedure involving carotid or cerebral vessels. The anesthesia and operative records should identify the intracranial treatment, the procedure performed, and the anesthesia practitioner’s attendance and time. This code has 7 base units. Medicare payment is (base units + time units) × the locality’s anesthesia conversion factor; time is reported in minutes and converted to 15-minute units to one decimal place, starting when the practitioner begins preparing the patient for anesthesia and ending when the practitioner is no longer in personal attendance and the patient can safely be placed under postoperative care.

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 01933 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

01933 rates by state

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

How the 01933 rate is calculated

Each of 01933’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 01933

01933 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

01933 compared with similar codes

How to choose

01925Arterial intervention anesthesiaCarotid or coronary arteries

01925 covers interventional radiological procedures involving carotid or cerebral vessels; 01933 covers therapeutic interventional radiology procedures directed intracranially.

01926Interventional anesthesiaIntracranial, intracardiac, or aortic

01926 is the category for interventional radiology procedures involving intracranial, intracardiac, or aortic procedures. 01933 identifies therapeutic intracranial intervention.

01924Arterial interventionOther arterial sites

01924 covers therapeutic interventional radiology involving arterial procedures not otherwise specified; 01933 identifies therapeutic intracranial procedures.

01922Imaging anesthesiaImaging or radiation therapy

01922 applies to anesthesia for noninvasive imaging or radiation therapy. 01933 is for anesthesia during a therapeutic interventional radiology procedure within the intracranial compartment.

Codes related to 01933

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