Summary & Overview
CPT 86317: Quantitative Immunoassay for Antibodies to Infectious Agent
CPT code 86317 captures a quantitative immunoassay to measure antibodies to an infectious agent when no more specific code applies. This laboratory procedure is clinically important for diagnosing past or current infections and monitoring immune responses, with implications for public health surveillance, patient management, and laboratory billing consistency nationwide. Major national payers commonly involved in coverage of this type of laboratory service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find concise benchmarks and clinical context for how CPT code 86317 is used across outpatient and hospital laboratory settings, guidance on typical sites of service, and a summary of payer coverage patterns. The publication highlights common billing and coding considerations, documentation expectations for quantitative immunoassays, and areas where policy updates can affect reimbursement and claims processing. Data not available in the input is noted where relevant.
Billing Code Overview
CPT code 86317 describes a laboratory immunoassay performed to quantitate antibodies to an infectious agent when that specific antibody test is not described by another code. The service entails analytical measurement of a patient specimen to determine antibody concentration related to infectious disease exposure or immune response.
Service Type: Quantitative immunoassay, serologic testing
Typical Site of Service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A 34-year-old outpatient presents to a hospital-affiliated laboratory with a requisition to quantify serum antibodies to a suspected infectious agent not covered by a specific CPT immunoassay code. The clinician documents recent symptoms of fever and malaise with a possible exposure history; orders include a serologic immunoassay to measure IgG and/or IgM antibody levels to help establish recent or prior infection. The specimen (serum or plasma) is collected in the clinic or phlebotomy station, labeled, and transported to the clinical laboratory. The laboratory analyst performs a validated quantitative immunoassay using automated platforms or manual ELISA techniques, runs controls and calibrators, interprets instrument output, and reports a numeric antibody concentration with reference ranges. Results are delivered to the ordering provider via the electronic medical record for clinical interpretation, potential confirmatory testing, and treatment decisions. Typical sites of service include independent and hospital-based clinical laboratories, outpatient laboratory draw stations, and ambulatory clinics with on-site phlebotomy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting only the professional interpretation component if separated from the technical lab work |
51 |