CPT 87640: Staphylococcus aureus Nucleic Acid Detection, Amplified Probe

CPT code 87640 denotes a laboratory molecular diagnostic test that uses an amplified probe technique to detect Staphylococcus aureus nucleic acid. This technical-component laboratory procedure is clinically important for rapid identification of S. aureus infections and can influence infection control, antimicrobial selection, and downstream clinical management. Nationally, molecular detection methods like those represented by CPT code 87640 are part of broader efforts to improve diagnostic accuracy and reduce time to targeted therapy.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find a concise overview of what CPT code 87640 represents, typical sites of service, and the clinical context for its use. The publication also covers payer coverage patterns, commonly reported modifiers, and related policy considerations affecting laboratory molecular diagnostics. Benchmarks and policy updates are summarized to provide context on utilization and billing practice trends. The material is intended to support billing professionals, laboratory managers, and policy analysts seeking a practical, national-level briefing on CPT code 87640.

Billing Code Overview

CPT code 87640 describes a laboratory technical procedure in which a lab analyst performs an amplified probe technique to detect Staphylococcus aureus nucleic acid. The procedure is a molecular diagnostic test that identifies the presence of S. aureus genetic material in a patient specimen.

Service Type: Laboratory, Molecular Diagnostic (Technical Component)

Typical Site of Service: Clinical laboratory or hospital laboratory

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Clinical Context

A typical patient is an adult presenting to an urgent care or outpatient clinic with localized skin and soft tissue infection signs (erythema, swelling, purulent drainage) or a history of prior methicillin-resistant Staphylococcus aureus (MRSA) colonization. The clinician collects a swab from the wound, nares, or other site and sends the specimen to the clinical molecular laboratory. In the laboratory, a medical technologist or molecular technologist performs an amplified probe nucleic acid amplification test to detect Staphylococcus aureus nucleic acid. Results are reported to the ordering clinician to guide targeted antibiotic therapy, infection control (eg, MRSA decolonization), or surgical planning. Typical sites of service include outpatient clinic, urgent care, emergency department, and hospital clinical laboratories performing molecular diagnostics.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation component separate from technical services (rare for this lab test).
`TC`	Technical component	Use when billing only the laboratory technical component (most common for hospital/independent labs performing the assay).

Taxonomy Code	Specialty	Notes
207Q00000X	Clinical Laboratory	Laboratory directors and clinical laboratory personnel who oversee molecular diagnostics.
207L00000X	Clinical Laboratory Testing	Technologists who perform nucleic acid amplification assays.
207P00000X	Pathology	Pathologists who interpret complex molecular test results and provide consultative reports.
207K00000X	Infectious Disease Diagnostics	Specialists involved in test selection and result interpretation for infectious agents.
208000000X	Emergency Medicine	Emergency clinicians ordering rapid molecular testing for acute presentations.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`L03.115`	Cellulitis of right lower limb	Molecular testing for S. aureus informs targeted therapy for skin and soft tissue infections.
`L03.116`	Cellulitis of left lower limb	Same relevance for unilateral cellulitis; helps detect MRSA carriage or infection.
`L02.91`	Cutaneous abscess, unspecified	Abscesses often yield purulent material for molecular testing to rapidly identify S. aureus.
`A49.02`	Methicillin resistant Staphylococcus aureus infection, unspecified site	Directly relevant — nucleic acid testing identifies S. aureus and can suggest MRSA presence depending on target.
`Z22.322`	Carrier of other staphylococcus aureus	Relevant for surveillance and decolonization programs using molecular assays (eg, nares swab).

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87070`	Culture, bacterial, any other source, other than urine, with isolation and presumptive identification of isolates	Performed when culture confirmation and susceptibility testing are needed after molecular detection.
`87802`	Infectious agent antigen detection by immunoassay with direct optical observation; multiple-step method, qualitative or semiquantitative	Alternate rapid method for Staphylococcus antigen detection in some settings; may be ordered concurrently or sequentially.
`87471`	Infectious agent detection by nucleic acid (DNA or RNA); Staphylococcus aureus, amplified probe technique, direct probe technique	Related molecular assays for Staphylococcus species; used depending on test platform and laboratory protocol.
`87081`	Culture, bacterial, aerobic, with isolation and presumptive identification	Used when aerobic bacterial culture is indicated for wound infections alongside molecular testing.
`87088`	Culture, bacterial, with antimicrobial susceptibility; Kirby-Bauer, disk diffusion	Performed following positive culture to determine antibiotic susceptibilities guiding therapy.

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Summary & Overview