Summary & Overview

CPT 86664: EBV EBNA Antibody Immunoassay

CPT code 86664 represents an immunoassay performed on patient serum to detect antibodies to Epstein–Barr virus nuclear antigen (EBNA). This serologic assay is clinically important for distinguishing past EBV infection and assessing immune status, with implications for diagnosis, epidemiology, and transplant or immunocompromised patient management. As a commonly billed laboratory service, it factors into national outpatient and inpatient laboratory utilization and coverage policy discussions.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for EBNA antibody testing, typical sites of service, and the role of the test in patient care. The publication summarizes available benchmarks and coverage considerations, highlights coding and billing implications for the service line, and notes where input data was not provided.

This national-level summary is intended for billing managers, laboratory directors, and policy analysts seeking a clear, practical reference for CPT code 86664, its clinical purpose, and payer coverage landscape. Data not available in the input is explicitly indicated where necessary.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare86664CPTlaboratoryserologyimmunoassayEpstein-Barr virusEBNA antibodyclinical laboratory

Billing Code Overview

CPT code 86664 describes an immunoassay for Epstein–Barr virus nuclear antigen (EBNA) antibodies performed on a patient’s serum. The test identifies antibodies to the EBNA component of Epstein–Barr virus (EBV), which aids in determining past infection and immune status.

Service Type: Laboratory serology test — antibody (immunoassay)

Typical Site of Service: Clinical laboratory or hospital laboratory

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A young adult presents to an outpatient clinic with fever, sore throat, cervical lymphadenopathy, fatigue, and atypical lymphocytosis on a complete blood count. The primary care clinician orders serologic testing for Epstein–Barr virus (EBV) to distinguish acute infection from past exposure. A venous blood specimen is collected at the clinic or a phlebotomy draw station and sent to the hospital or reference laboratory. The laboratory performs an immunoassay targeting Epstein–Barr nuclear antigen (EBNA) IgG antibodies using automated analyzers. Results are reported to the ordering clinician; a positive EBNA IgG with negative acute markers suggests past infection, while absence of EBNA with positive viral capsid antigen (VCA) IgM suggests recent or acute EBV infection. Typical sites of service include outpatient clinics, hospital outpatient laboratories, community phlebotomy centers, and independent reference laboratories. Billing reflects a laboratory immunoassay service performed by clinical laboratory personnel under CPT code 86664.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional (interpretation) portion if the laboratory splits technical and professional components and physician interpretation is billed separately.
`TC`	Technical component	Use when billing only the technical component for the laboratory performing the assay and sending the result; common for independent labs.
`90`	Reference (outside) laboratory	Use when the performing laboratory is an outside (reference) lab different from the ordering or billing entity.
`91`	Repeat clinical diagnostic laboratory test	Use when the test is repeated on the same day to obtain subsequent result for validity or instrument verification.
`59`	Distinct procedural service	Use when this test is billed on the same day as another lab test and it is a distinct service not normally billed together.
`52`	Reduced services	Use if a test is partially performed or limited for clinical reasons and a reduced fee applies.
`90`	Reference (outside) laboratory	Use when the performing laboratory is an outside (reference) lab different from the ordering or billing entity.
`91`	Repeat clinical diagnostic laboratory test	Use when the test is repeated on the same day to obtain subsequent result for validity or instrument verification.
`95`	Synchronous telemedicine service rendered via real-time interactive audio and video	Not typically applicable to laboratory reporting but may be used if results are explained via telemedicine visit when payer allows.
`QW`	CLIA waived test	Not applicable to `86664` (moderately complex), included only if a waived equivalent method exists and payer permits.
`XE`	Separate encounter	Use when a separate encounter modifier is required to indicate this lab test was furnished during a separate encounter from another service.
`XU`	Unusual non-overlapping service	Use when distinct and separate lab testing meets criteria for billing separate from other services.
`59`	Distinct procedural service	Use when this test is billed on the same day as another lab test and it is a distinct service not normally billed together.

Taxonomy Code	Specialty	Notes
`207Q00000X`	Clinical Laboratory	Performs and directs laboratory testing, including immunoassays.
`207L00000X`	Pathology	Pathologists may oversee assay validation, interpretation, and reporting.
`208D00000X`	Family Medicine	Ordering clinicians in primary care who evaluate mononucleosis-like illness.
`207R00000X`	Clinical Cytogenetics/ Molecular Genetics	Labs with molecular/serologic testing capabilities; oversight for infectious serology.
`208000000X`	Internal Medicine	Internists commonly order EBV serology in adults with compatible symptoms.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`B27.90`	Infectious mononucleosis, unspecified	Primary clinical indication for EBV serology to confirm acute or recent EBV infection.
`R50.9`	Fever, unspecified	Common presenting symptom prompting evaluation including EBV serology when other signs suggest mononucleosis.
`J02.9`	Acute pharyngitis, unspecified	Sore throat is a frequent complaint leading to EBV testing when typical features of mononucleosis are present.
`R59.0`	Enlarged lymph nodes	Cervical lymphadenopathy often prompts EBV antibody testing.
`R53.83`	Other fatigue	Profound fatigue is associated with EBV infection and supports ordering serologic testing.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`86664`	Antibody; Epstein-Barr virus nuclear antigen (EBNA) (e.g., IgG)	Primary code for the EBNA IgG immunoassay described.
`86663`	Antibody; Epstein-Barr virus viral capsid antigen (VCA), IgM	Commonly ordered alongside `86664` to identify acute EBV infection (VCA IgM positive with EBNA negative indicates recent infection).
`86665`	Antibody; Epstein-Barr virus viral capsid antigen (VCA), IgG	Used with `86664` to determine immune status versus past infection (VCA IgG and EBNA IgG positive consistent with past infection).
`86669`	Antibody; mononucleosis (Epstein-Barr) heterophile test (e.g., Monospot)	Rapid screening test often used initially in outpatient settings; positive Monospot may prompt confirmatory testing with `86663`/`86664`.
`80053`	Comprehensive metabolic panel	Frequently ordered in same encounter to assess hepatic function in suspected infectious mononucleosis.