# CPT 84450

> Not at a published national rate. CPT 84450 carries status X (statutory exclusion) in the Q2 2014 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 aspartate aminotransferase, an enzyme that sits inside liver cells but is also plentiful in heart and skeletal muscle. When those cells are damaged the enzyme spills into the bloodstream, so a raised level flags tissue injury without pinning down the location. It is almost always interpreted next to ALT, its more liver-specific counterpart, and the ratio between the two carries its own meaning.

## Selected release

- Release: Q2 2014 (2014 B)
- Effective: April 1 – June 30, 2014
- 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: 35.8228
- Formula: `(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor`

## Source and citation

- Source: Physician relative value file (Q2 2014)
- CMS file: https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu14b.zip
- Parsed file: PPRRVU14_V0324.csv, row 13,391
- Canonical page: https://localishealth.com/cpt/84450/2014/B
- Release-specific citation URL: https://localishealth.com/cpt/84450/2014/B
- Last significant update: 2026-08-04T03:05:19+00:00