Summary & Overview
CPT 86850: Antibody Screen, Each Serum Technique
CPT 86850 represents an antibody screen performed by each serum technique to detect unexpected red cell antibodies prior to transfusion or during diagnostic evaluation. Nationally, antibody screening is a core transfusion-medicine laboratory service that supports patient safety, blood compatibility, and treatment planning for hemolytic conditions. The code applies to lab-based immunohematology workflows where identification of clinically significant alloantibodies informs transfusion decisions and therapeutic monitoring.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare. The publication provides a concise overview of coverage considerations across major commercial payers, common clinical contexts supporting use of the code, and its relationship to related serologic procedures.
Readers will learn: the clinical purpose of the procedure, typical site-of-service expectations, common ICD-10 diagnosis contexts that justify testing, related CPT codes used in compatibility and blood typing workflows, and commonly reported modifiers. The report highlights how the code is used within transfusion medicine service lines and laboratory operations. Data gaps are noted where input lacked specific reimbursement or service-line metadata.
CPT Code Overview
CPT 86850 is an antibody screen performed using each serum technique to detect unexpected red blood cell antibodies that may cause transfusion reactions or hemolytic disease. This test assesses patient serum against reagent red cells to identify clinically significant alloantibodies.
Service Type: Transfusion Medicine Procedures
Typical Site of Service: Laboratory (POS 81)
Clinical & Coding Specifications
Clinical Context
A patient presents for pre-transfusion evaluation or investigation of hemolytic anemia. A blood specimen is sent to the transfusion medicine laboratory where technologists perform an antibody screen using serum techniques to detect clinically significant alloantibodies. Results guide compatibility testing and transfusion decisions, and may be ordered during an inpatient hospital stay or as an outpatient lab order for monitoring known antibody development.
Coding Specifications
Modifier 91 - Repeat Clinical Diagnostic Laboratory Test
- Used when the same antibody screen test is performed again on the same day to confirm or verify results.
Modifier 59 - Distinct Procedural Service
- Used when the antibody screen is a separate and distinct service from other procedures performed at the same encounter.
Associated provider taxonomies:
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291U00000X— Clinical Medical Laboratory -
207ZP0102X— Pathology - Clinical Pathology -
207Q00000X— Family Medicine Physician