# CPT 77300

> Medicare paid $67.34 for CPT 77300 in the office (non-facility) setting and $67.34 in a facility under the Q4 2021 Physician Fee Schedule, effective October 2021. These are the national allowed amounts before the ~2% sequestration cut and before locality (GPCI) adjustment. This price has been unchanged since Q1 2021, when it decreased 0.8%.

## What it is

The physics calculation that turns a treatment plan into actual machine settings for one beam or treatment area: working out how long the beam must run, and how much dose reaches a given depth or point, accounting for the beam energy, field size, distance, and any wedges or blocks in the path. A physicist or dosimetrist performs it and the radiation oncologist reviews and signs off. It is the routine per-calculation unit of radiation physics work, distinct from the physician planning that precedes it.

## Selected release

- Release: Q4 2021 (2021 D)
- Effective: October 1 – December 31, 2021
- Status indicator: A
- Office (non-facility) national allowed amount: $67.34
- Facility national allowed amount: $67.34
- Sequestration: not applied

## RVUs and formula

- Work RVU: 0.62
- Office (non-facility) practice expense RVU: 1.28
- Facility practice expense RVU: 1.28
- Malpractice RVU: 0.03
- Conversion factor: 34.8931
- Formula: `(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor`

## Source and citation

- Source: Physician relative value file (Q4 2021)
- CMS file: https://www.cms.gov/files/zip/rvu21d.zip
- Parsed file: PPRRVU21_OCT.csv, row 13,458
- Canonical page: https://localishealth.com/cpt/77300/2021/A
- Release-specific citation URL: https://localishealth.com/cpt/77300/2021/D
- Last significant update: 2026-08-04T03:10:59+00:00