CPT code 84478 represents a laboratory assay that measures triglyceride levels in a patient specimen, a routine component of lipid panels used to evaluate cardiovascular risk. Nationally, triglyceride testing is a common diagnostic and monitoring tool for patients with atherosclerosis, hyperlipidemia, metabolic syndrome, and other conditions linked to heart disease. The availability and utilization of this test affect clinical decision-making for primary care, cardiology, and endocrinology practices and are relevant to laboratory reimbursement and quality reporting.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the test, the typical service setting, and an overview of payer coverage patterns. The publication also summarizes typical benchmarks and billing considerations relevant to laboratories and providers billing for 84478, highlights common modifiers used alongside laboratory CPT codes, and notes where input data is not available. This material is intended to inform administrators, billing professionals, and clinicians about the clinical role of the test and the payer landscape at a national level.