# CPT 83090

> Not at a published national rate. CPT 83090 carries status X (statutory exclusion) in the Q3 2021 release. The statutory definition of physician services does not include this item. Treat the blank amount as unpriced, not as $0.

## What it is

Measures homocysteine, an amino acid that builds up in the blood when the body runs short of vitamin B12, folate, or vitamin B6, since those vitamins are what allow it to be broken down. It also rises in inherited disorders of that same metabolic pathway. Beyond vitamin status, a high level is treated as a marker of increased risk for clotting and vascular disease.

## Selected release

- Release: Q3 2021 (2021 C)
- Effective: July 1 – September 30, 2021
- Status indicator: X
- Office (non-facility) national allowed amount: not published
- Facility national allowed amount: not published
- Sequestration: not applied

## RVUs and formula

- Work RVU: not published
- Office (non-facility) practice expense RVU: not published
- Facility practice expense RVU: not published
- Malpractice RVU: not published
- 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 (Q3 2021)
- CMS file: https://www.cms.gov/files/zip/rvu21c-updated-6302021.zip
- Parsed file: PPRRVU21_JUL.csv, row 14,615
- Canonical page: https://localishealth.com/cpt/83090/2014/B
- Release-specific citation URL: https://localishealth.com/cpt/83090/2021/C
- Last significant update: 2026-08-04T03:10:45+00:00