Summary & Overview
CPT 82785: Quantitative Immunoglobulin E Assay
CPT code 82785 denotes a clinical laboratory test that quantifies immunoglobulin E (IgE) in a patient specimen. Nationally, measurement of IgE supports diagnosis and management of allergic disorders and certain immune conditions; accurate laboratory coding and billing for this service affect claims processing, clinical workflows, and payment consistency across payers. This code represents the technical component of an IgE assay performed by laboratory personnel and is typically billed for laboratory-based analysis rather than the clinical interpretation.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of payer coverage patterns and billing considerations for CPT code 82785, including common sites of service and the role of the test in clinical care. The publication outlines benchmarks for utilization where available, summarizes relevant policy and coding considerations, and provides clinical context for when quantitative IgE testing is used. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 82785 describes a laboratory technical procedure in which a lab analyst measures the quantity of immunoglobulin E (IgE) in a clinical specimen. This test is a clinical laboratory service used to assess IgE levels, often in the context of allergic sensitization or immune system evaluation.
Service Type: Clinical laboratory testing — quantitative immunoassay for immunoglobulin E
Typical Site of Service: Clinical laboratory or hospital laboratory (specimen collected in outpatient clinic or other ambulatory settings; analysis performed in a certified laboratory)
Clinical & Coding Specifications
Clinical Context
A 28-year-old patient with a history of seasonal allergic rhinitis and suspected food allergy presents to an outpatient allergy clinic. The clinician orders quantitative serum immunoglobulin E testing to assess total IgE levels as part of the allergy workup and to support allergen-specific IgE interpretation. A phlebotomist obtains a blood specimen in the clinic and sends it to the laboratory. In the clinical laboratory, a medical technologist or lab analyst performs the technical assay to quantify total IgE in the specimen using immunoassay or similar automated methodology. Results are transmitted to the ordering provider’s electronic medical record; the clinician interprets the numeric IgE value in the context of clinical history and may order follow-up allergen-specific IgE testing or referral to an allergist-immunologist for management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the physician interpretation component when separated from the technical lab work. |
TC | Technical component | Use when reporting only the laboratory technical component; commonly appended by the performing lab. |