Summary & Overview
CPT 86356: Quantitation of Mononuclear Cell Antigen, Flow Cytometry
CPT code 86356 covers the technical laboratory procedure for quantitating a mononuclear cell antigen not described by another code, commonly performed using flow cytometry. This code captures specialized immunophenotyping work that supports diagnosis, monitoring, and research for hematologic and immunologic conditions. Nationally, accurate coding for 86356 matters because it affects laboratory reporting, clinical decision support, and payer coverage determinations for specialized cell-based assays.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for the test, typical sites of service, and the common modifiers associated with billing. The publication summarizes benchmark considerations for utilization and reimbursement, clarifies coding scope relative to other flow cytometry and antigen assays, and highlights policy and coverage themes that commonly affect payment and claim adjudication.
This summary equips laboratory managers, coding professionals, and policy analysts with the information needed to identify when 86356 is the appropriate CPT code, understand its clinical purpose, and anticipate payer considerations at the national level. Data not available in the input include payer-specific reimbursement rates and associated ICD-10 diagnosis mappings.
Billing Code Overview
CPT code 86356 describes a laboratory analytic procedure in which a laboratory analyst quantifies a mononuclear cell antigen that is not specified by another code. The analysis is typically performed using flow cytometry or similar cell-based immunophenotyping techniques.
Service type: Laboratory — quantitative antigen testing on mononuclear cells (flow cytometry-based analysis)
Typical site of service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A 58-year-old outpatient with suspected hematologic malignancy is referred for immunophenotyping of peripheral blood or bone marrow to quantify a mononuclear cell antigen by flow cytometry. The clinician orders a targeted assay to measure expression of an antigen not otherwise specified by other CPT codes to help characterize lymphocyte or monocyte populations, monitor minimal residual disease, or guide therapy selection. A phlebotomy or bone marrow aspirate is collected and transported to the clinical laboratory. The laboratory technologist performs specimen accessioning, prepares cells (red cell lysis or washing), incubates with fluorescently labeled monoclonal antibodies directed against the antigen of interest, runs samples on a flow cytometer, and analyzes the data to produce percent-positive and mean fluorescence intensity results. The laboratory director reviews and signs the final report; results are routed to the ordering hematologist/oncologist for integration into the clinical plan.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when only the physician interpretation / reporting portion is billed separately from the technical laboratory work |
TC | Technical component |