Billing code 77333: Radiation aidMedicare rate & RVUs in Texas
Reports an intermediate-complexity device designed or constructed to shape, modify, or support a patient’s external-beam radiation treatment.
Medicare pays $127.45–$144.00 for 77333 in the office in Texas, from Beaumont to Austin. 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 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 in Texas
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
8 payment localities
$127.45 to $144.00
8 of 8 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Austin | $144.00 | Unavailable |
| Beaumont | $127.45 | Unavailable |
| Brazoria | $136.51 | Unavailable |
| Dallas | $137.19 | Unavailable |
| Fort Worth | $136.09 | Unavailable |
| Galveston | $136.79 | Unavailable |
| Houston | $137.53 | Unavailable |
| Rest Of Texas | $131.78 | Unavailable |
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.
How the rate is built · 77333
RVUs × geographic indexes × conversion factor
Swap in your local Medicare rate.
Work 0.73Practice expense 3.35Malpractice 0.04
All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.
Payment rules and modifiers for 77333
The CMS indicators that decide how 77333 is paid alongside other services.
CMS payment indicators · 77333
Radiation aid
| 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
77333 without 26 · national office
$137.61
Radiation aid
77333-26 · Professional component
$39.08
Pays only the interpretation and report.
77333 compared with similar codes
Compare codes
77333 vs 77332 vs 77334 vs 77338: national Medicare rates
Swap in your local Medicare rate.
How to choose
- 77332Treatment aid
- Use 77332 for a simple treatment aid. 77333 is for an aid whose design and construction reaches the intermediate level.
- 77334Radiation treatment device
- Use 77334 when the treatment aid meets the complex level; 77333 describes intermediate complexity.
- 77338MLC design
- 77338 specifically identifies design of a multileaf collimator device for an IMRT plan. 77333 is the intermediate-level code for other radiation treatment aids.
77333 billing questions
How does 77333 differ from 77332 and 77334?
These codes distinguish treatment aids by design and construction complexity. Use 77332 for the simple level, 77333 for the intermediate level, and 77334 for the complex level.
What documentation supports 77333?
Document the particular aid designed or constructed and its role in shaping the radiation beam or supporting reproducible patient positioning. The record should support the intermediate complexity level.
Can 77333 be reported with modifier 26 or TC?
CMS recognizes separately priced professional and technical components. Modifier 26 identifies the professional component, TC identifies the equipment-and-staff component, and billing without either modifier represents the global service.
How should units be determined?
Base reporting on each distinct treatment aid furnished and documented, rather than the number of treatment fractions or beam angles. Select the appropriate complexity level for each aid.
Is dose calculation included in 77333?
77333 represents the treatment aid, while 77300 represents a radiation therapy dose calculation. Report both only when the record supports each as a distinct service.
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
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