Summary & Overview
CPT 82232: Beta-2 Microglobulin Assay (Serum/Urine/CSF)
CPT code 82232 denotes a quantitative laboratory assay measuring beta-2 microglobulin in serum, cerebrospinal fluid, or urine. This biomarker assay is clinically valuable for assessing renal dysfunction, gauging activity in certain leukemias and hematologic conditions, and identifying elevations linked to inflammatory and infectious diseases. As a discrete laboratory CPT code, 82232 is relevant to hospital laboratories, independent clinical labs, and outpatient specimen collection sites nationwide.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find national-level context on clinical indications tied to the test, typical sites of service where the assay is performed, and operational considerations for billing this laboratory service. The publication outlines common modifiers in use and notes where data are available or absent.
This summary provides clinicians, laboratorians, and billing professionals with a concise reference to the clinical purpose of 82232, the settings in which it is commonly performed, and the payer landscape addressed. Data not available in the input is identified explicitly elsewhere in the document.
Billing Code Overview
CPT code 82232 reports a laboratory measurement of beta-2 microglobulin concentration, commonly performed on serum, cerebrospinal fluid (CSF), or urine. The assay quantifies beta-2 microglobulin levels to assist clinical evaluation of renal disease, monitor activity in certain hematologic malignancies such as leukemias, and detect elevated levels associated with Crohn’s disease, sarcoidosis, viral infections, and other malignancies.
Service type: Clinical laboratory test (quantitative protein assay)
Typical site of service: Clinical laboratory or hospital laboratory, with specimens collected in outpatient phlebotomy settings, inpatient hospital units, or specialty clinics performing CSF or urine collection.
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with a history of chronic kidney disease and recent unexplained rise in serum creatinine presents to the nephrology clinic. The nephrologist orders a serum beta-2 microglobulin assay to assess tubular protein handling and to help differentiate glomerular versus tubular injury. Blood is drawn in the clinic or outpatient phlebotomy lab, labeled, and sent to the clinical laboratory. The laboratory analyst performs the 82232 assay, reporting quantitative beta-2 microglobulin concentration. Results are reviewed by the ordering nephrologist to inform staging of renal disease and to correlate with other studies (e.g., serum creatinine, urine protein) and with hematology if there is concern for lymphoproliferative disease.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional interpretation/oversight of the laboratory test if separated from the technical component. |
TC | Technical component | When billing only the laboratory technical component (equipment, supplies, technician time) if separated. |