Summary & Overview
CPT 84206: Proinsulin Assay of Plasma
CPT code 84206 identifies a laboratory assay for measuring proinsulin in a patient specimen, typically plasma. This specialized endocrine pathology test informs evaluation of insulin processing, beta-cell dysfunction, and certain hypoglycemia or diabetes-related diagnostic pathways. Nationally, accurate coding of such assays matters for clinical documentation, laboratory billing consistency, and payer coverage determinations.
Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of payer coverage patterns where available, common billing and coding considerations, and clinical context for when the test is used. The publication also summarizes typical sites of service and the clinical scenarios that drive ordering of proinsulin testing.
The analysis addresses benchmarks and policy-relevant items such as coverage variability across commercial payers and Medicare, documentation expectations for laboratory claims, and how the test fits into diabetes and hypoglycemia workups. Where vendor- or payer-specific policies are not available, the report notes that data is not available in the input. The content is intended for laboratory managers, billing professionals, and clinical leaders seeking a concise national summary of CPT code 84206 and its role in endocrine laboratory testing.
Billing Code Overview
CPT code 84206 describes a laboratory assay in which a lab analyst measures the level of proinsulin in a patient specimen, such as plasma. The test quantifies circulating proinsulin, a precursor to insulin, used in clinical evaluation of insulin production, beta-cell function, and certain hypoglycemia or diabetes-related investigations.
Service type: Laboratory / Clinical pathology test
Typical site of service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A 52-year-old outpatient with a history of obesity and persistent fasting hyperglycemia is referred by an endocrinologist for biochemical evaluation of insulin secretion and processing. The patient presents to an outpatient phlebotomy clinic attached to a hospital laboratory. A morning blood draw is obtained after an overnight fast; plasma is collected and sent to the clinical laboratory. The lab analyst performs a 84206 proinsulin assay to quantify circulating proinsulin levels, supporting differentiation between insulin resistance, beta-cell dysfunction, and rare insulin-processing disorders. Results are reported to the ordering endocrinologist, who integrates proinsulin level with fasting insulin, C-peptide, glucose, and clinical history to guide diagnostic consideration (for example, distinguishing hyperproinsulinemia from normal proinsulin-to-insulin processing). Typical site of service: outpatient hospital laboratory or independent reference laboratory. Service type: clinical laboratory biochemical assay performed by a laboratory professional on plasma specimen.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional component (interpretation) if separate from technical processing |