# CPT 83721

> Not at a published national rate. CPT 83721 carries status X (statutory exclusion) in the Q4 2015 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 LDL, the so-called bad cholesterol, directly in a blood sample instead of arriving at it by arithmetic. A standard lipid panel usually estimates LDL from total cholesterol, HDL, and triglycerides, and that estimate degrades badly when triglycerides are high. Measuring the particle directly sidesteps that problem, and some direct methods also work without requiring the patient to fast beforehand.

## Selected release

- Release: Q4 2015 (2015 D)
- Effective: October 1 – December 31, 2015
- 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: 35.9335
- Formula: `(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor`

## Source and citation

- Source: Physician relative value file (Q4 2015)
- CMS file: https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu15d.zip
- Parsed file: PPRRVU15_OCT05_V1001.csv, row 13,441
- Canonical page: https://localishealth.com/cpt/83721/2014/B
- Release-specific citation URL: https://localishealth.com/cpt/83721/2015/D
- Last significant update: 2026-08-04T03:06:14+00:00