CPT code 83735 represents a clinical chemistry laboratory test that measures magnesium concentration in a patient specimen. Magnesium testing is a common diagnostic tool for assessing electrolyte balance, metabolic status, and monitoring patients with conditions that affect magnesium homeostasis. Nationally, magnesium measurement is an important laboratory service across inpatient and outpatient settings because it informs management of cardiac, neuromuscular, and metabolic disorders.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of how CPT code 83735 is classified, where the test is typically performed, and what clinical contexts commonly prompt ordering the test. The publication outlines benchmark considerations, payer coverage patterns, and relevant policy and billing issues for clinical labs and providers who perform or bill for magnesium testing.

The content provides practical reference material for coding teams, lab managers, and revenue cycle staff seeking clarity on the clinical purpose and service setting of CPT code 83735. Data not available in the input are noted where applicable.