77331 Special radiation dosimetry
Also known as: Special dosimetry, Custom dosimetry
Special radiation treatment dosimetry service.
In Plain Language
Special measurements for radiation dose verification
Clinical Context
Specialized dosimetric measurements including in vivo dosimetry, phantom studies, or verification dosimetry for complex treatment scenarios.
RVU Breakdown
| Work RVU | 0.85 |
| Total RVU | 0.85 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Radiology codes require a written order, clinical indication, and a formal interpretation report. The professional component (modifier -26) and technical component (modifier -TC) may be billed separately.
How This Code Compares
With a work RVU of 0.85, this code ranks in the 53rd percentile among Radiology codes — 1.0x the median (0.81). The highest wRVU in this category is 11.57.
Specialties
Frequently Asked Questions
What is CPT code 77331?
CPT 77331 (Special radiation dosimetry) is a Radiology code. Special radiation treatment dosimetry service.
Who uses CPT code 77331?
CPT 77331 is used by Radiation Oncology, Radiology. Specialized dosimetric measurements including in vivo dosimetry, phantom studies, or verification dosimetry for complex treatment scenarios.
When is CPT 77331 used?
Specialized dosimetric measurements including in vivo dosimetry, phantom studies, or verification dosimetry for complex treatment scenarios.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.