Summary & Overview
CPT 89055: Stool Leukocyte Analysis
CPT code 89055 denotes a technical laboratory procedure to detect leukocytes in a stool specimen, reported as positive/negative or with a semiquantitative result. This test is clinically relevant for evaluating inflammatory causes of gastrointestinal symptoms and can influence diagnostic workups for infections or inflammatory bowel disease. Nationally, it is a routine laboratory service performed in clinical and hospital laboratories and is part of standard stool testing panels in acute and outpatient settings.
Key payers in standard coverage reviews include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for CPT code 89055, typical sites of service, common billing modifiers (listed separately), and the scope of services the code represents. The publication also highlights benchmarks and policy considerations relevant to payer coverage, coding best practices, and operational implications for laboratory service lines.
This summary is intended to orient billing professionals, laboratory managers, and policy analysts to the clinical purpose and billing identity of CPT code 89055, and to indicate what is available versus what input data did not provide.
Billing Code Overview
CPT code 89055 describes a laboratory technical procedure in which a lab analyst examines a stool specimen for the presence of leukocytes. The test reports either a positive/negative result or a semiquantitative finding (for example, one-plus or moderate amount), indicating whether leukocytes are present in the specimen.
Service Type: Clinical laboratory test — stool leukocyte analysis
Typical Site of Service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to an outpatient clinic or emergency department with acute onset of diarrhea, abdominal cramping, fever, or suspected infectious gastroenteritis. The clinician collects a stool specimen to evaluate for the presence of fecal leukocytes as part of an initial stool workup to help distinguish inflammatory (bacterial or invasive) diarrhea from noninflammatory causes (viral, toxin-mediated). The specimen is delivered to the clinical laboratory where a laboratory analyst performs the technical test to detect leukocytes in the stool and reports results as negative, positive, or semiquantitative (e.g., 1+ to 3+). Results inform further diagnostic steps such as stool culture, ova and parasite testing, molecular pathogen panels, or initiation of targeted therapy. Typical site of service is the hospital laboratory, outpatient clinic laboratory, or independent clinical laboratory associated with a medical office or emergency department.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component (if applicable) — rarely used for this purely technical lab test. |
52 | Reduced services |