Summary & Overview
CPT 85007: Manual Differential White Blood Cell Count
CPT code 85007 represents a manual differential white blood cell (WBC) count, a laboratory service in which a trained analyst microscopically examines stained blood smears to count and classify leukocytes. This test remains clinically important for distinguishing bacterial from viral infections and for detecting hematologic disorders such as leukemia. Nationally, manual differentials are part of foundational hematology diagnostics used across hospitals, reference laboratories, and outpatient clinical labs.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a consolidated view of clinical context for CPT code 85007, common service locations, and payer coverage considerations. The publication outlines benchmarks and utilization patterns, summarizes relevant billing practices for the manual differential service, and highlights policy updates that affect laboratory billing and documentation for microscopic WBC differentials.
This summary provides clinicians, laboratory managers, and revenue cycle professionals with a clear description of the service represented by CPT code 85007, practical context for where the service is performed, and the payer landscape likely to affect reimbursement and documentation expectations at a national level.
Billing Code Overview
CPT code 85007 describes a manual differential white blood cell (WBC) count performed by a laboratory analyst. The service involves microscopic examination of stained blood smears to manually count and differentiate white blood cells (leukocytes). This manual differential helps distinguish bacterial from viral infections and can identify hematologic disorders such as leukemia.
Service Type: Laboratory — manual differential/hematology microscopy
Typical Site of Service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A 32-year-old outpatient presents to the laboratory with fever, sore throat, and malaise. The clinician orders a complete blood count with manual white blood cell differential to evaluate for bacterial versus viral infection and to screen for hematologic abnormalities. A phlebotomy technician collects a peripheral blood specimen, which is sent to the hematology laboratory. A medical laboratory scientist (MLS) prepares stained blood smears and performs a manual differential by microscopically counting and classifying 100 white blood cells to report percentages and absolute counts of neutrophils, lymphocytes, monocytes, eosinophils, and basophils. The technical component includes smear preparation, staining, microscope analysis, and documentation. Results are reported to the ordering provider and integrated into the patient’s electronic health record for clinical correlation with symptoms and other laboratory data.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional component (interpretation) if applicable and separately billed for microscopy interpretation by a pathologist or physician. |
TC | Technical component |