CPT 82979: Glutathione Reductase Assay in Red Blood Cells

CPT code 82979 represents a laboratory enzymatic assay that quantifies glutathione reductase activity in red blood cells, a key measure of cellular antioxidant capacity. Nationally, this test contributes to diagnosis and monitoring of conditions involving oxidative stress and hemolytic or metabolic disorders where impaired glutathione recycling may be relevant. It is typically ordered by clinicians evaluating unexplained hemolysis, metabolic dysfunction, or specific toxic exposures that affect redox balance.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for the assay, typical sites of service, and the service type. The publication outlines where this test fits into diagnostic workflows and what stakeholders commonly review when assessing coverage and utilization.

The report provides national benchmarks and payer coverage context where available, summarizes relevant clinical implications of reduced glutathione reductase activity, and highlights policy considerations that affect laboratory test reimbursement and billing. Data limitations are noted as "Data not available in the input" where specific payer policies, taxonomies, ICD-10 mappings, or related billing codes were not provided.

Billing Code Overview

CPT code 82979 measures glutathione reductase activity in red blood cells, an enzyme assay that evaluates the ability of erythrocytes to regenerate reduced glutathione and protect against oxidative stress. The test quantifies the enzymatic reduction of oxidized glutathione, providing information about cellular antioxidant capacity and potential hemolytic or metabolic disorders.

Service Type: Laboratory enzymatic assay

Typical Site of Service: Clinical laboratory or hospital laboratory

Clinical Context

A typical patient is an adult referred by a hematologist or primary care physician for evaluation of unexplained hemolytic anemia, suspected oxidative hemolysis, or suspected red blood cell enzyme deficiency. The patient may present with fatigue, jaundice, dark urine, pallor, or hemoglobinuria following exposure to oxidative drugs or infections. Laboratory workflow: a phlebotomy draw is obtained in EDTA tube; sample transported to the clinical laboratory; red blood cells are washed and hemolysate prepared; a laboratory technologist or clinical chemist performs an enzymatic assay to measure glutathione reductase activity in erythrocytes. Results are reviewed by the laboratory director and reported to the ordering clinician. Typical site of service is an outpatient clinical laboratory or hospital laboratory, often ordered from hematology clinic or emergency department. The service is billed as a specialized biochemical assay when assessment of red cell antioxidant capacity is clinically indicated for diagnosis, monitoring, or evaluation of suspected enzymopathies or oxidative hemolysis.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional (interpretation) portion if the lab separates technical and professional components.
`TC`

Taxonomy Code	Specialty	Notes
207RH0000X	Hematology	Physicians who diagnose and manage hemolytic anemias and order specialized red cell enzymatic testing.
207RC0000X	Clinical Pathology	Pathologists and laboratory directors overseeing biochemical and enzymatic assays.
2080P0207X	Clinical Laboratory Science/Medical Technologist	Professionals performing the assay and laboratory testing procedures.
207L00000X	Pediatrics (Hematology)	Pediatric hematologists may order similar testing in children with suspected enzymopathies.
207M00000X	Internal Medicine	Internists may order initial evaluation for anemia and oxidative hemolysis.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`D55.0`	Anemia due to glucose-6-phosphate dehydrogenase [G6PD] deficiency	G6PD deficiency causes oxidative hemolysis; glutathione reductase testing helps evaluate red cell antioxidant pathways.
`D58.9`	Hereditary hemolytic anemia, unspecified	Used when hereditary enzymopathies are suspected and enzyme assays are part of diagnostic evaluation.
`D59.0`	Drug-induced autoimmune hemolytic anemia	To differentiate immune-mediated hemolysis from enzymatic/oxidative causes; enzyme testing may be adjunctive.
`D59.1`	Other hemolytic anemias due to enzyme disorders	Directly relevant when specific red cell enzyme defects are suspected; glutathione reductase is an enzyme of interest.
`R78.1`	Abnormal levels of blood constituents (elevated bilirubin)	Hyperbilirubinemia from hemolysis often prompts evaluation including red cell enzyme activity.
`T50.9X5A`	Adverse effect of unspecified drug, initial encounter	Exposure to oxidant drugs can precipitate hemolysis; enzymatic testing may be ordered during evaluation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`82962`	Glutathione, reduced; quantitative assay	Performed when measuring reduced glutathione levels can complement glutathione reductase activity to assess redox status.
`84443`	Thyroid stimulating hormone (TSH) assay	Often ordered in parallel in differential diagnosis of fatigue and anemia but not directly related to enzyme assay.
`85025`	Blood count; automated differential WBC and platelet count	A CBC is commonly ordered before or with specialized red cell enzyme testing to document anemia and hemolysis.
`82150`	Blood, ammonia; quantitative	In cases of severe hemolysis or metabolic concern, metabolic panels including ammonia may be performed adjunctively.
`86140`	Antibody; hemolytic (e.g., DAT/Coombs)	Direct antiglobulin testing is commonly performed alongside to differentiate immune from enzymatic hemolysis.

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Summary & Overview