CPT code 77333: Radiation aid, intermediate complexity2026 Medicare rate & RVUs

Medicare pays $137.61 for 77333 nationally in the office. Local office rates run $121.19–$189.13.

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

What 77333 covers

This code covers the design and construction of a radiation treatment aid used to shape or modify the beam or help position the patient reproducibly. Examples of treatment aids across this code family include shielding blocks, bolus, and immobilization devices. Radiation oncologists, dosimetrists, and radiation therapy teams use these devices in external-beam treatment planning and delivery. The intermediate level is selected by the device’s design and construction complexity, not simply by the diagnosis or treatment site.

Choose this level when the documented device is more involved than a simple aid but does not meet the complex level. Record what was designed or fabricated and how it supports treatment; report distinct devices at the applicable level when separately documented. CMS recognizes professional and technical components: modifier 26 identifies the professional component, modifier TC the technical component involving equipment and staff, and no modifier represents the global service.

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 77333 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

77333 rates by state

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

How the 77333 rate is calculated

Each of 77333’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 77333

The CMS indicators that decide how 77333 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

77333 compared with similar codes

How to choose

77332Treatment aidSimple device

Use 77332 for a simple treatment aid. 77333 is for an aid whose design and construction reaches the intermediate level.

77334Radiation treatment deviceComplex device

Use 77334 when the treatment aid meets the complex level; 77333 describes intermediate complexity.

77338MLC designPer IMRT plan

77338 specifically identifies design of a multileaf collimator device for an IMRT plan. 77333 is the intermediate-level code for other radiation treatment aids.

Codes related to 77333

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