# CPT 77338

> Medicare paid $480.48 for CPT 77338 in the office (non-facility) setting and $480.48 in a facility under the Q1 2021 Physician Fee Schedule, effective January 2021. These are the national allowed amounts before the ~2% sequestration cut and before locality (GPCI) adjustment. This is a 3.4% decrease from the previous quarter.

## What it is

Designing and setting up the beam-shaping hardware that makes intensity-modulated treatment possible. A multi-leaf collimator is a bank of narrow metal leaves in the head of the linear accelerator; each leaf moves independently, and the sequence of their positions carves the beam into the shapes the IMRT plan calls for. This covers working out and constructing those leaf patterns for the specific plan, and is done once per plan rather than at each treatment session.

## Selected release

- Release: Q1 2021 (2021 A)
- Effective: January 1 – March 31, 2021
- Status indicator: A
- Office (non-facility) national allowed amount: $480.48
- Facility national allowed amount: $480.48
- Sequestration: not applied

## RVUs and formula

- Work RVU: 4.29
- Office (non-facility) practice expense RVU: 9.27
- Facility practice expense RVU: 9.27
- Malpractice RVU: 0.21
- 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 (Q1 2021)
- CMS file: https://www.cms.gov/files/zip/rvu21a-updated-01052021.zip
- Parsed file: PPRRVU21_JAN.csv, row 13,396
- Canonical page: https://localishealth.com/cpt/77338/2021/A
- Release-specific citation URL: https://localishealth.com/cpt/77338/2021/A
- Last significant update: 2026-08-04T03:10:16+00:00