CPT code 82784 represents a quantitative laboratory assay for a specific gamma globulin (IgA, IgD, IgG, or IgM) in biologic specimens such as serum, plasma, cerebrospinal fluid, or other bodily fluids. This technical laboratory service is central to diagnosing and monitoring immune disorders, infectious diseases, and certain neuromuscular or hematologic conditions, making it a commonly ordered clinical chemistry test across inpatient and outpatient settings.

Key payers in the national landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for immunoglobulin quantification, typical sites of service where the technical component is performed, and the payer mix considered in this publication. The report also presents benchmark-oriented content covering utilization patterns and common billing practices, summarizes relevant policy considerations affecting coverage and payment, and clarifies documentation elements typically associated with laboratory services.

This material is intended for healthcare administrators, lab directors, and revenue cycle staff who need a concise reference to the clinical purpose of CPT code 82784, the service setting, and the payer environment affecting laboratory billing and coverage decisions. Data not available in the input will be noted where applicable.