Billing code 77334: Radiation treatment deviceMedicare rate & RVUs

Medicare pays $126.26 for 77334 nationally in the office. Local office rates run $113.04–$167.82.

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

What 77334 covers

This service involves designing and constructing a complex device used to shape radiation or position the patient for treatment. Examples include irregular shielding blocks, special shields, compensators, and custom molds or casts. A radiation oncologist provides the professional work, while dosimetrists, physicists, or mold room staff may help design and fabricate the device. The work takes place in hospital radiation oncology departments and freestanding treatment centers.

Report one unit for each distinct complex device constructed, rather than one unit for every field in which the same device is used. Choose among 77332, 77333, and 77334 by the documented device design and construction, not the complexity of the treatment plan. Records should identify each device, its purpose, and the work supporting its complexity. CMS prices a professional component, reported with modifier 26, and a technical component, reported with modifier TC. An unmodified claim represents both components when the billing entity furnishes both; a physician billing separately for the professional work reports 26.

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 77334 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

77334 rates by state

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

How the 77334 rate is calculated

Each of 77334’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 77334

The CMS indicators that decide how 77334 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

77334 compared with similar codes

How to choose

77333Radiation aid

77333 covers intermediate devices, such as multiple standard blocks or bite blocks. Choose 77334 for documented complex design and construction, such as an irregular block, compensator, or custom mold.

77332Treatment aid

77332 covers simple treatment devices. Choose 77334 when the documented device requires complex design and construction, rather than assigning a level based on treatment-plan complexity.

77338MLC design

77338 covers multileaf collimator device design and construction for an IMRT plan. Use 77334 for a distinct complex physical treatment device, such as a custom mold or irregular block.

Codes related to 77334

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