CPT code 84480 represents a laboratory test that measures total triiodothyronine (total T3) in patient blood. Total T3 is a key thyroid hormone assay used in diagnosing and monitoring thyroid disorders. Nationally, this test is widely performed across outpatient and inpatient laboratory settings and has implications for endocrine care pathways, medication management, and diagnostic workflows.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of billing and clinical context, common modifiers associated with laboratory services, and typical sites of service. The publication summarizes how 84480 is reported in claims, expected clinical indications for ordering total T3, and where this test fits within thyroid function panels. It also highlights benchmarking and policy-relevant considerations such as payer coverage variability, coding accuracy, and the role of lab validation in reimbursement.

The report is intended for health plan analysts, revenue cycle professionals, laboratory managers, and clinicians seeking a clear, national-level briefing on CPT code 84480, its clinical purpose, and billing context. Data not available in the input is noted where applicable.