# CPT 22633

> Medicare paid $1,905.16 for CPT 22633 in the office (non-facility) setting and $1,905.16 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 1.6%.

## What it is

A lower-back fusion done from behind that combines two techniques at the same level: bone graft laid along the back of the spine and its side joints, and graft or a spacer placed into the cleared disc space between the vertebral bodies. Doing both is meant to give a more reliable, all-around fusion than either alone. This code is for one interspace at one segment; a second level fused the same way is reported additionally.

## Selected release

- Release: Q4 2021 (2021 D)
- Effective: October 1 – December 31, 2021
- Status indicator: A
- Office (non-facility) national allowed amount: $1905.16
- Facility national allowed amount: $1905.16
- Sequestration: not applied

## RVUs and formula

- Work RVU: 27.75
- Office (non-facility) practice expense RVU: 18.89
- Facility practice expense RVU: 18.89
- Malpractice RVU: 7.96
- 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 6,649
- Canonical page: https://localishealth.com/cpt/22633/2021/A
- Release-specific citation URL: https://localishealth.com/cpt/22633/2021/D
- Last significant update: 2026-08-04T03:10:59+00:00