CPT code 87140 covers immunofluorescence testing performed on a previously isolated and identified organism to refine its classification, often to a specific taxonomic type. This laboratory procedure supports clinical decision-making, infection control, epidemiologic tracking, and targeted therapy selection by providing more specific organism-level information than routine identification alone. Nationally, specialized organism characterization is a vital part of diagnostic microbiology workflows and laboratory reporting.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The analysis addresses coverage and coding considerations across major commercial payers and the Medicare program.

Readers will find a concise overview of the clinical context and appropriate site of service, common modifiers associated with lab billing, and where CPT code 87140 fits among related laboratory services. The publication summarizes coding intent, typical use cases in hospital and clinical laboratories, and highlights areas where payers commonly focus review efforts. Data not available in the input is noted when specific payer policy details, associated taxonomies, ICD-10 diagnoses, and related codes are not provided.