Summary & Overview
CPT 86658: Enterovirus Antibody Immunoassay, Serum or CSF
CPT code 86658 identifies a laboratory immunoassay that detects antibodies to enteroviruses in serum or cerebrospinal fluid. This test is used in clinical evaluation of suspected enteroviral infections — including illnesses caused by coxsackievirus, echovirus, and poliovirus — and contributes to diagnostic decision-making for neurologic and systemic presentations. Nationally, accurate coding for serologic enterovirus testing affects surveillance, billing consistency, and lab service utilization.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for use of the assay, typical sites of service, and the common payer landscape relevant to this laboratory procedure. The publication summarizes coding interpretation and common modifiers in use, benchmark considerations for reimbursement and utilization where available, and operational factors affecting laboratory workflows and billing for immunoassays.
The content provides clinicians, laboratory billing staff, and policy analysts with a concise reference to the clinical purpose of CPT code 86658, payer coverage context, and what to expect when this service appears on a claim. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 86658 describes an immunoassay performed by a laboratory analyst to detect antibodies to enteroviruses (for example, coxsackievirus, echovirus, and poliovirus) in a patient’s serum or cerebrospinal fluid. The test identifies immune response markers that help clinicians evaluate suspected enteroviral infection or immune exposure.
Service Type: Laboratory immunoassay for enterovirus antibodies
Typical Site of Service: Clinical laboratory, hospital laboratory, or reference laboratory; specimen sources commonly include serum and cerebrospinal fluid (CSF)
Clinical & Coding Specifications
Clinical Context
A 6-year-old child presents to the pediatric emergency department with fever, neck stiffness, and irritability after three days of upper respiratory symptoms. Cerebrospinal fluid is obtained by lumbar puncture to evaluate for viral versus bacterial meningitis. CSF and paired serum samples are sent to the clinical laboratory for immunoassay testing for enterovirus-specific IgM/IgG to detect recent or current enteroviral infection (e.g., coxsackievirus or echovirus). The laboratory analyst performs the immunoassay, documents specimen type (serum or CSF), assay method, reagent lot, controls, and result interpretation in the laboratory information system. Results are communicated to the ordering clinician to support diagnosis and management; positive enterovirus antibodies in CSF or a rising serum titer may confirm enteroviral meningitis and influence treatment, isolation, and reporting decisions. Typical site of service is the hospital laboratory or independent reference laboratory associated with an inpatient or emergency department encounter.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional interpretation component if applicable and billed separately from the technical laboratory component. |
TC |