Summary & Overview
CPT 84085: RBC 6–Phosphogluconate Dehydrogenase Assay
CPT code 84085 identifies a laboratory enzymatic assay measuring red blood cell 6–phosphogluconate dehydrogenase. This specialized hematology test informs evaluation of red blood cell metabolic pathways and can support diagnosis of enzyme-related hemolytic disorders. Nationally, precise coding for niche laboratory procedures like 84085 matters for clinical documentation, billing accuracy, and programmatic monitoring of rare diagnostic testing.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The overview addresses how payers classify and reimburse specialized hematology assays, common billing practices, and the clinical contexts in which the test is ordered.
Readers will learn the clinical purpose of the assay, typical service setting (clinical or hospital laboratory), and the scope of payers referenced. The publication summarizes benchmark considerations, coding notes, and policy factors relevant to reimbursement and administrative processing of this laboratory service. Data not provided in the input are noted as unavailable.
Billing Code Overview
CPT code 84085 describes a laboratory assay performed by a lab analyst to evaluate the level of red blood cell 6–phosphogluconate dehydrogenase in a patient specimen. This test assesses an enzyme involved in the pentose phosphate pathway and can be used in the clinical evaluation of red blood cell metabolic function.
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Service type: Laboratory test (enzymatic assay)
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Typical site of service: Clinical laboratory or hospital laboratory
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Clinical & Coding Specifications
Clinical Context
A 28-year-old patient with a history of hemolytic anemia is referred to the hematology laboratory for biochemical evaluation of red blood cell enzyme function. The clinician documents intermittent episodes of jaundice, fatigue, and episodic dark urine after oxidative stress (for example, sulfa antibiotic exposure). A venous blood sample is collected in the laboratory and processed to separate red blood cells for enzymatic assay. The lab analyst performs a quantitative assay to determine RBC 6–phosphogluconate dehydrogenase activity (CPT 84085) to confirm suspected enzyme deficiency or to help differentiate causes of nonimmune hemolysis. Results are reported to the ordering hematologist; reflex testing (e.g., glucose-6-phosphate dehydrogenase studies, hemoglobinopathy testing, or reticulocyte count) may be ordered based on results. Typical site of service is an outpatient hospital laboratory, independent clinical laboratory, or inpatient hospital laboratory depending on clinical setting.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Unmodified professional service | Rarely used; indicates the service is reported without modifier when no other modifier applies |
11 |