# CPT 88342

> Medicare paid $108.48 for CPT 88342 in the office (non-facility) setting and $108.48 in a facility under the Q1 2019 Physician Fee Schedule, effective January 2019. These are the national allowed amounts before the ~2% sequestration cut and before locality (GPCI) adjustment. This is a 2.8% decrease from the previous quarter.

## What it is

A test in which a laboratory-made antibody is applied to a tissue slide to reveal whether a specific protein is present, followed by the pathologist's reading of the stained slide. The antibody carries a marker that produces visible color wherever its target protein sits, so the result is read as a pattern on the tissue rather than as a number. Immunohistochemistry is how pathologists identify what type of cell a tumor came from when appearance alone is ambiguous. This code covers the first antibody run on a given tissue block; further antibodies on the same block are reported separately.

## Selected release

- Release: Q1 2019 (2019 A)
- Effective: January 1 – March 31, 2019
- Status indicator: A
- Office (non-facility) national allowed amount: $108.48
- Facility national allowed amount: $108.48
- Sequestration: not applied

## RVUs and formula

- Work RVU: 0.70
- Office (non-facility) practice expense RVU: 2.28
- Facility practice expense RVU: 2.28
- Malpractice RVU: 0.03
- Conversion factor: 36.0391
- Formula: `(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor`

## Source and citation

- Source: Physician relative value file (Q1 2019)
- CMS file: https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu19a.zip
- Parsed file: PPRRVU19_V1213.csv, row 15,158
- Canonical page: https://localishealth.com/cpt/88342/2019/A
- Release-specific citation URL: https://localishealth.com/cpt/88342/2019/A
- Last significant update: 2026-08-04T03:08:45+00:00