Summary & Overview
CPT 86332: Immunoassay for Antibodies to Immune Complex
CPT code 86332 represents a laboratory immunoassay used to detect antibodies to immune complexes in patient serum. This test identifies antibodies bound to antigens, which can assist clinicians and laboratories in diagnosing or monitoring immune-mediated conditions. Nationally, immunoassays like CPT code 86332 are important components of diagnostic workflows for autoimmune and infectious disease evaluation because they provide targeted serologic information that can influence clinical decision-making and lab utilization.
Key payers in scope for this code include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the test and its clinical role, benchmarks and utilization context where available, common billing considerations, and relevant coding notes. The publication outlines payer coverage patterns, typical sites of service, and the clinical scenarios in which the assay is most commonly ordered.
This summary provides a national perspective on the code’s clinical meaning and operational implications for laboratories and billing teams. Data not available in the input is explicitly noted where applicable in detailed sections.
Billing Code Overview
CPT code 86332 describes an immunoassay performed on a patient’s serum to detect antibodies bound to an antigen, i.e., antibodies to an immune complex. The procedure involves laboratory analysis to identify antibody–antigen complexes that can indicate immune-mediated disease processes.
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Service type: Laboratory immunoassay analysis
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Typical site of service: Clinical laboratory or hospital laboratory setting
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient presents to an outpatient laboratory after referral from a rheumatology clinic for serologic evaluation of suspected immune complex–mediated disease. The clinician documents symptoms of persistent arthralgia, low-grade fever, and a recent urticarial rash, and orders an immunoassay to detect antibodies bound to circulating immune complexes. The patient has blood drawn in the phlebotomy area of the hospital outpatient laboratory; the specimen is sent to the clinical immunology laboratory. A laboratory technologist performs an immunoassay (single or panel) to detect antibodies directed to immune complexes; results are reviewed by the lab analyst and reported to the ordering provider. Typical workflow steps: order entry in the electronic health record, specimen collection and labeling, specimen accessioning, performance of the 86332 immunoassay, result verification, and release of the report to the ordering clinician. Typical site of service: outpatient laboratory or hospital clinical immunology laboratory. Service type: laboratory immunoassay (serologic) for antibodies to immune complexes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional (interpretation) portion if applicable and separate from the technical component |
TC | Technical component | When billing only the technical portion (laboratory testing) of the service |
59 | Distinct procedural service | When this immunoassay is a distinct service from another procedure performed on the same day and documentation supports distinctness |
91 | Repeat clinical diagnostic laboratory test | When the same immunoassay is repeated on the same day for validity/confirmation |
90 | Reference (outside) laboratory | When this test is sent to an outside/reference laboratory and needs to indicate lab of performance |
76 | Repeat procedure by same provider | When the identical immunoassay is repeated by the same provider (if applicable) |
77 | Repeat procedure by another provider | When the identical immunoassay is repeated by a different provider (if applicable) |
52 | Reduced services | When the test is partially performed or modified and full service was not provided |
53 | Discontinued procedure | When specimen collection or testing was started but discontinued before completion |
90 | Reference (outside) laboratory | When reporting that the test was performed by an external laboratory laboratory (used where payer requires) |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207RH0000X | Pathology | Clinical pathologists/direct lab directors who oversee immunology testing |
207K00000X | Clinical Laboratory | Laboratory medicine specialists and directors who manage testing operations |
208000000X | Family Medicine | Ordering primary care providers commonly initiating serologic testing |
207L00000X | Allergy & Immunology | Specialists who frequently order and interpret immune complex antibody testing |
207RC0000X | Rheumatology | Specialists who manage autoimmune and immune complex diseases and order these assays |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
M35.9 | Systemic involvement of connective tissue, unspecified | Connective tissue diseases can produce circulating immune complexes; this test aids in serologic evaluation |
M32.9 | Systemic lupus erythematosus, unspecified | SLE is classically associated with immune complex formation and testing for antibodies to immune complexes may be relevant |
M05.9 | Rheumatoid arthritis with rheumatoid factor, unspecified | RA can involve immune complex–mediated pathology; serologic assays support diagnosis and monitoring |
L95.9 | Ulcerative vasculitis, unspecified | Vasculitic processes may be immune complex–mediated; antibody detection assists in workup |
R50.9 | Fever, unspecified | Unexplained fever with systemic symptoms may prompt immune complex testing as part of diagnostic evaluation |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
80053 | Comprehensive metabolic panel | Commonly ordered at the same visit to assess organ function and support interpretation of immunologic testing |
85025 | Complete blood count (CBC) with automated differential | Frequently performed alongside serologic tests to assess inflammatory markers and hematologic status |
86431 | Antigen detection by enzyme immunoassay technique, multiple-step method; for infectious agents, each agent | Performed in differential workflows when specific antigen/antibody testing is needed in addition to immune complex assays |
86701 | HIV-1 antigen(s), with HIV-1 and HIV-2 antibody, single result | Example of serologic testing that may be ordered in concurrent infectious workup when immune complex disease is suspected |
86580 | Skin test; tuberculosis, intradermal | Represents additional immunologic evaluation sometimes performed by the ordering clinician as part of an immune evaluation |