Summary & Overview

CPT 0427U: Early Sepsis Indicator (Monocyte Distribution Width)

CPT code 0427U designates the proprietary Beckman Coulter Early Sepsis Indicator, a laboratory assay that derives monocyte distribution width (MDW) from a blood sample submitted for a complete blood count with differential. As a PLA code, 0427U applies to a single manufacturer-specific test and must be reported in addition to an appropriate CBC with differential code, such as 85004 or 85025. The code is clinically important because MDW is a biomarker linked to severe infection and elevated sepsis risk, supporting early identification of patients who may need prompt evaluation.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical context, reporting conventions, and where the test is typically performed. The publication summarizes common billing modifiers and national payer considerations, outlines the relationship between 0427U and CBC reporting, and provides policy and reimbursement context for a national audience. This resource is intended for coding professionals, laboratory administrators, and clinician leaders seeking a clear description of the test, its billing placement alongside CBC with differential, and the payers commonly encountered in national practice. Data not available in the input has been noted and omitted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0427UCPTProprietary Laboratory AnalysesMonocyte Distribution WidthEarly Sepsis IndicatorLaboratory MedicineHematologySepsis Biomarker

Billing Code Overview

CPT code 0427U is a Proprietary Laboratory Analyses (PLA) code that reports the Beckman Coulter Early Sepsis Indicator. The test uses a blood specimen submitted for a complete blood count (CBC) with differential; the Beckman Coulter hematology analyzer automatically measures monocyte distribution width (MDW) as a biomarker associated with severe infection and sepsis risk. Report 0427U only in addition to a code for CBC with differential, such as 85004 or 85025.

Service Type: Laboratory — proprietary hematology-derived biomarker assay

Typical Site of Service: Clinical laboratory or hospital laboratory using Beckman Coulter hematology analyzers

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult presenting to the emergency department or inpatient ward with suspected infection, systemic inflammatory response, or early signs of sepsis (fever, tachycardia, hypotension, altered mental status, leukocytosis or leukopenia). A blood specimen is drawn for a routine complete blood count with differential (CBC with differential, e.g., 85004 or 85025). The sample is processed on a Beckman Coulter hematology analyzer that automatically measures Monocyte Distribution Width (MDW) as an Early Sepsis Indicator using the proprietary Beckman Coulter assay. The laboratory reports MDW alongside CBC/differential results; clinicians use the MDW value as an adjunctive biomarker to stratify risk for severe infection or sepsis, informing monitoring intensity and further diagnostic testing such as blood cultures, lactate measurement, and empiric antimicrobial decisions. Typical sites of service include hospital emergency departments, inpatient clinical laboratories, and hospital-based outpatient phlebotomy clinics. The service type is a proprietary laboratory analysis (PLA) added to a CBC with differential order; billing uses 0427U in addition to the appropriate CBC/differential CPT code.

Coding Specifications

Modifier	Description	When to Use

Taxonomy Code	Specialty	Notes
207Q00000X	Pathology	Laboratory oversight, test validation, and interpretive roles.
207K00000X	Clinical Laboratory	Laboratory directors and clinical laboratory scientists responsible for processing and reporting.
208D00000X	Emergency Medicine	Ordering clinicians who commonly request MDW testing for suspected sepsis in ED patients.
207LP2900X	Hematology	Hematologists and lab hematology specialists overseeing CBC/differential and derived parameters.
208000000X	Hospitalist/Internal Medicine	Inpatient physicians who use MDW results for sepsis risk stratification.

CPT Code	Description	Relationship to This Procedure
`85004`	Blood count; automated, blood cell count and automated differential WBC count	Often the ordered primary test; `0427U` is reported in addition to a CBC with differential such as `85004` when MDW is generated from the same specimen.
`85025`	Blood count; automated complete blood count (CBC) with automated differential WBC count	Alternative CBC with differential code commonly paired with `0427U`; MDW is derived from the CBC-differential workflow.
`0001U` is not in provided list and therefore omitted
`0427U`	Early Sepsis Indicator (Monocyte Distribution Width) — Beckman Coulter	This PLA code specifically reports the MDW assay value; billed in addition to the CBC/differential code when the Beckman Coulter analyzer produces MDW.

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