# CPT 86431

> Not at a published national rate. CPT 86431 carries status X (statutory exclusion) in the Q2 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

A blood test that measures how much rheumatoid factor is present, reporting an actual concentration rather than a simple positive or negative. Rheumatoid factor is an antibody directed against the body's own immunoglobulin, and elevated levels are associated with rheumatoid arthritis and several other conditions. Because it also rises in chronic infections, liver disease, and in some healthy older adults, it is interpreted alongside symptoms and more specific antibody tests.

## Selected release

- Release: Q2 2021 (2021 B)
- Effective: April 1 – June 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 (Q2 2021)
- CMS file: https://www.cms.gov/files/zip/rvu21b-updated-03022021.zip
- Parsed file: PPRRVU21_APR.csv, row 14,954
- Canonical page: https://localishealth.com/cpt/86431/2014/B
- Release-specific citation URL: https://localishealth.com/cpt/86431/2021/B
- Last significant update: 2026-08-04T03:10:33+00:00