Billing code 77334: Radiation treatment deviceMedicare rate & RVUs in Illinois
Design and construction of a complex radiation treatment device, such as an irregular shielding block, compensator, or custom mold, reported for each distinct device.
Medicare pays $119.83–$130.41 for 77334 in the office in Illinois, from Rest Of Illinois to Suburban Chicago. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
On this page 9 sections
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 in Illinois
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
4 payment localities
$119.83 to $130.41
| Payment locality | Office | Facility |
|---|---|---|
| Chicago | $129.55 | Unavailable |
| East St. Louis | $121.34 | Unavailable |
| Rest Of Illinois | $119.83 | Unavailable |
| Suburban Chicago | $130.41 | Unavailable |
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.
How the rate is built · 77334
RVUs × geographic indexes × conversion factor
Swap in your local Medicare rate.
Work 1.12Practice expense 2.60Malpractice 0.06
All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.
Payment rules and modifiers for 77334
The CMS indicators that decide how 77334 is paid alongside other services.
CMS payment indicators · 77334
Radiation treatment device
| Rule | CMS value | What it means |
|---|---|---|
| Global period | XXX | The global surgery concept doesn’t apply. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 1 | Diagnostic test with separate professional (26) and technical (TC) components. |
What modifiers do to the payment
Modifier 26 · payment effect
With and without the modifier
77334 without 26 · national office
$126.26
Radiation treatment device
77334-26 · Professional component
$60.12
Pays only the interpretation and report.
77334 compared with similar codes
Compare codes
77334 vs 77333 vs 77332 vs 77338: national Medicare rates
Swap in your local Medicare rate.
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.
77334 billing questions
How many units of 77334 can be reported?
Report one unit for each distinct complex device designed and constructed. Document each device separately; using the same device for multiple fields does not make it multiple devices.
When is 77334 chosen over 77332 or 77333?
Select the level by the device's documented design and construction. Complex devices include irregular blocks, compensators, and custom molds or casts; 77332 covers simple devices, while 77333 covers intermediate devices such as multiple standard blocks or bite blocks.
Can 77334 be billed for an IMRT multileaf collimator design?
Report the IMRT multileaf collimator device design under 77338, not 77334. A distinct complex physical device may also support 77334 when separately constructed and documented.
How are the professional and technical components billed?
A physician billing separately for the professional work uses modifier 26. Modifier TC identifies the technical component on a claim for that component, while an unmodified claim represents both components when the billing entity furnishes both.
Is a device made at simulation separately reportable?
A distinct complex device designed and constructed at simulation may be reported with the simulation service when both are performed and documented. Do not assign a mask or other setup item to 77334 solely because it was made at simulation.
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
Show the CMS file lines behind this rate
Fee sheets
Put 77334 and the rest of your codes on one sheet
Build a fee sheet from your own code list at your locality, put your payer contracts beside Medicare, and see what changed each quarter.
Build my fee sheetOr price your code list free →