CPT code 86800 denotes a laboratory immunoassay performed on patient serum to detect antibodies to thyroglobulin. This test is clinically relevant for identifying autoimmune thyroid disorders and for monitoring patients with thyroid disease. As a widely used serologic assay, it features in national laboratory testing portfolios and interacts with major payers for coverage and reimbursement across outpatient and inpatient laboratory settings.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose of the test, typical sites of service, common modifiers in billing practice, and which payers are commonly involved in coverage decisions. The publication summarizes benchmark pricing and reimbursement patterns where available, highlights relevant policy updates affecting laboratory immunoassays, and provides clinical context for interpretation of test use.

This summary equips billing managers, laboratory directors, and policy analysts with a clear understanding of what CPT code 86800 represents, why it matters in national laboratory practice, and where to look for payer-specific guidance and performance benchmarks.