CPT code 86789 describes a laboratory immunoassay performed by a lab analyst to detect antibodies other than IgM to West Nile virus (WNV) in a patient’s serum or cerebrospinal fluid, representing a serologic antibody test for WNV; service type: laboratory infectious disease serology; typical site of service: hospital laboratory or independent clinical laboratory performing blood or CSF testing.

For related coverage guidance, see recent payer policy updates: Diagnosis of Idiopathic Environmental Intolerance, Allergen Testing, Allergen Testing.