CPT code 86780 denotes a laboratory immunoassay performed to detect antibodies to Treponema pallidum, the bacterium that causes syphilis. This serologic test is a cornerstone of syphilis diagnosis and surveillance and carries national relevance for public health screening, prenatal care, and sexually transmitted infection management. Testing accuracy and appropriate use influence clinical decision-making, follow-up testing algorithms, and population-level reporting.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical purpose of the test, typical sites where the service is performed, and payer coverage patterns. The publication provides benchmark information on coding and reimbursement, notes on common billing modifiers, and discussion of clinical context such as screening and diagnostic roles of serologic treponemal assays.

The article is organized to deliver practical reference material: a clear description of the code, payer considerations, common coding and billing practices, and clinical implications for use of serologic testing for syphilis. Data not available in the input are noted where applicable.