# CPT 88341

> The national PFS baseline was $93.86 for CPT 88341 in the Office (non-facility) setting and $93.86 in a facility under the Q3 2021 Physician Fee Schedule, effective July 2021. These are the national allowed amounts before locality (GPCI) adjustment; sequestration is excluded. Across payment localities, both settings' amount is $82.06–$123.87. This amount has been unchanged since Q1 2021, when it decreased 0.4%.

## What it is

Additional Immunohistochemistry Study

## Selected release

- Release: Q3 2021 (2021 C)
- Effective: July 1 – September 30, 2021
- Status indicator: A
- Office (non-facility) national allowed amount: $93.86
- Facility national allowed amount: $93.86
- Sequestration: not applied

## RVUs and formula

- Work RVU: 0.56
- Office (non-facility) practice expense RVU: 2.12
- Facility practice expense RVU: 2.12
- Malpractice RVU: 0.01
- 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 15,559
- Canonical page: https://localishealth.com/cpt/88341/2021/A
- Release-specific citation URL: https://localishealth.com/cpt/88341/2021/C
- Last significant update: 2026-08-13T15:11:57+00:00