Summary & Overview
CPT 86156: Cold Agglutinin Screening of Serum
CPT code 86156 represents a laboratory technical screening test for cold agglutinins, antibodies that induce red blood cell agglutination at subphysiologic temperatures. This test is clinically relevant for diagnosing cold agglutinin disease and evaluating hemolytic anemia or transfusion compatibility concerns. Nationally, standardized coding for this assay supports accurate lab billing, clinical decision-making, and surveillance of immune-mediated hemolysis.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for the test, typical sites of service, and the practical billing considerations tied to the technical lab component. The publication outlines common modifiers used with laboratory services and summarizes available payer coverage patterns where provided. Where input data is incomplete, the text notes that specific items are not available.
This summary equips laboratory managers, billing professionals, and policy analysts with the core coding definition, payer scope, and the topics addressed in the full publication: clinical purpose, billing and coding context, payer coverage overview, and areas flagged for further detail or policy clarity.
Billing Code Overview
CPT code 86156 describes a laboratory technical procedure used to screen a specimen, such as serum, for cold agglutinins — antibodies that cause red blood cells to clump when exposed to temperatures below normal body temperature. The procedure is a laboratory screening test performed by a lab analyst and involves handling, processing, and assessing the specimen for agglutination characteristics.
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Service type: Laboratory screening test (technical component)
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Typical site of service: Clinical laboratory or hospital laboratory (specimen obtained in outpatient or inpatient settings and processed in a lab)
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient presents with new-onset cold-induced hemolytic anemia symptoms including acrocyanosis, dark urine, and fatigue after recent upper respiratory infection. The clinician orders laboratory immunohematology testing to evaluate for cold agglutinins. A phlebotomy team draws a serum specimen and labels it with collection time and transport temperature instructions. The specimen is routed to the hospital clinical laboratory where a medical technologist or lab analyst performs the technical assay to screen for cold agglutinins (86156). The workflow includes specimen receipt and accessioning, appropriate warming or maintenance at room temperature to prevent in vitro agglutination artifacts, performance of the agglutination screening test, documentation of results in the laboratory information system, and communication of positive or significant titers to the ordering provider. Results guide additional testing (thermal amplitude studies, titers, direct antiglobulin test) and clinical management decisions about transfusion compatibility and immunologic evaluation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component if applicable under split billing arrangements for lab consulting pathologist review. |