Summary & Overview
CPT 86231: Endomysial Antibody (EMA) IgG/IgA Serology
CPT code 86231 identifies laboratory testing for endomysial antibodies (EMA) by immunoassay to detect EMA IgG and EMA IgA in serum. This serologic test is clinically important for diagnosing celiac disease and dermatitis herpetiformis and can provide information about patient adherence to gluten-free therapy. Nationally, EMA testing is part of the diagnostic laboratory armamentarium for autoimmune enteropathies and related dermatologic manifestations.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for EMA testing, typical sites of service, and the service type. The publication provides benchmarking context and policy-relevant details on coverage and coding practice where available, along with notes on test methodology and clinical interpretation. Data not available in the input is clearly identified when applicable.
This summary serves clinicians, laboratory billing staff, and policy analysts seeking concise guidance on the purpose and clinical relevance of CPT code 86231, how it is commonly performed, and which major national payers are considered in the accompanying analysis.
Billing Code Overview
CPT code 86231 describes testing to detect an endomysial antibody (EMA) directed against each immunoglobulin (Ig) class, for example EMA IgG or EMA IgA, in a specimen such as serum. A common laboratory method for performing this test is an immunoassay, for example an indirect immunofluorescence assay (IFA). The presence of EMA IgG and/or EMA IgA aids in diagnosing autoimmune conditions such as celiac disease and dermatitis herpetiformis, and test results may assist clinicians in monitoring patient adherence to treatment.
Service type: Laboratory immunoassay for serologic antibody identification.
Typical site of service: Clinical laboratory or hospital laboratory; specimen collection is commonly performed in outpatient phlebotomy settings, physician offices, or hospital outpatient collection areas.
Clinical & Coding Specifications
Clinical Context
A 34-year-old patient presents to a gastroenterology clinic with months of intermittent abdominal pain, bloating, chronic diarrhea, weight loss, and iron-deficiency anemia. The gastroenterologist suspects celiac disease and orders serologic testing including an endomysial antibody (EMA) panel to detect EMA IgA and, if indicated, EMA IgG. A phlebotomy draw is performed in the outpatient lab; the specimen is processed by the hospital or reference laboratory using an indirect immunofluorescence assay (IFA) or comparable immunoassay. Results are reviewed by the ordering provider to support diagnosis, guide need for duodenal biopsy, and monitor adherence to a gluten-free diet if the patient is already diagnosed. Typical sites of service include outpatient clinic, hospital outpatient laboratory, and independent clinical laboratories. The service is a laboratory diagnostic immunoassay directed at identification of antibodies to each immunoglobulin class of endomysial antibody, reported using 86231.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician interpretation or professional component of the test separate from the laboratory technical work. |
TC |