Summary & Overview
CPT 86157: Cold Agglutinin Titration, Laboratory Serology
CPT code 86157 designates a laboratory titration assay for cold agglutinins—antibodies that cause red blood cells to clump at below-normal body temperatures. This test is used in evaluating cold agglutinin disease, autoimmune hemolytic anemia, and other conditions where cold-reactive antibodies are clinically relevant. As a specific titration code, it captures a quantitative laboratory procedure performed by trained laboratory personnel.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Coverage and billing practices for 86157 can vary across commercial carriers and Medicare, affecting claims processing, bundling, and medical necessity reviews.
Readers will find a concise overview of the clinical purpose and laboratory setting for the code, typical sites of service, and the common modifiers associated with laboratory billing. The publication also outlines what to expect in payer coverage patterns, coding considerations for reporting a titration procedure versus screening tests, and areas where policy updates or payer-specific rules commonly influence reimbursement and claim adjudication. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 86157 describes a laboratory titration test for cold agglutinins, measuring antibodies that cause red blood cells to agglutinate at temperatures below normal body temperature. The procedure is performed by a laboratory analyst using a patient specimen such as serum and is specific to titration rather than qualitative screening.
Service type: Clinical laboratory diagnostic test — serology (antibody titration)
Typical site of service: Clinical laboratory or hospital laboratory (laboratory testing facility)
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult who presents with symptoms of hemolytic anemia (fatigue, jaundice, dark urine, pallor) or unexplained cold-induced acrocyanosis and Raynaud-like symptoms. The clinician suspects cold agglutinin disease or secondary cold-reactive antibodies related to infection (e.g., Mycoplasma pneumoniae), lymphoproliferative disorder, or autoimmune disease. A venous blood specimen is collected and sent to the clinical laboratory with a request for cold agglutinin titration.
In the laboratory workflow the specimen is kept at 37°C during transport and initial processing to prevent in vitro agglutination. The lab analyst performs a serial dilution titration using patient serum and group O red blood cells, incubates at refrigerated temperatures (typically 4°C), and observes the highest dilution showing agglutination to determine the cold agglutinin titer. Results are reported to the ordering clinician with interpretation (titer value and clinical significance). Typical site of service is an outpatient or inpatient hospital laboratory or independent clinical reference laboratory with trained medical technologists and supervision by a pathologist or laboratory medicine physician.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician/pathologist interpretation or supervisory professional component separate from the technical laboratory work. |