# CPT 83735

> Not at a published national rate. CPT 83735 carries status X (statutory exclusion) in the Q2 2017 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 magnesium in a blood sample. Magnesium is essential to muscle and nerve signalling and to a steady heart rhythm, and it has an important quirk: when it is low, potassium and calcium often refuse to come back up no matter how much of those are replaced, until the magnesium itself is corrected. Levels drop with poor nutrition, heavy alcohol use, ongoing losses from the gut, and several very common medications including diuretics and acid-reducing drugs.

## Selected release

- Release: Q2 2017 (2017 B)
- Effective: April 1 – June 30, 2017
- 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: 35.8887
- Formula: `(work_rvu × work_gpci + pe_rvu × pe_gpci + mp_rvu × mp_gpci) × conversion_factor`

## Source and citation

- Source: Physician relative value file (Q2 2017)
- CMS file: https://www.cms.gov/medicare/medicare-fee-for-service-payment/physicianfeesched/downloads/rvu17b.zip
- Parsed file: PPRRVU17_V0209.csv, row 13,814
- Canonical page: https://localishealth.com/cpt/83735/2014/B
- Release-specific citation URL: https://localishealth.com/cpt/83735/2017/B
- Last significant update: 2026-08-04T03:07:42+00:00