CPT 87541: Legionella pneumophila Detection by Amplified Nucleic Acid Probe - OpenPayer

Summary & Overview

CPT 87541: Legionella pneumophila Detection by Amplified Nucleic Acid Probe

CPT code 87541 covers a molecular diagnostic test that detects Legionella pneumophila using an amplified nucleic acid probe. This assay is used to identify a key bacterial cause of Legionnaires’ disease and is important for outbreak detection and infection control in facilities with complex water or HVAC systems. Nationally, timely and accurate identification of L. pneumophila influences public health responses and clinical management of suspected legionellosis.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The analysis addresses payer coverage patterns, where available, and situates the test within laboratory service lines and hospital infection-control workflows.

Readers will learn the clinical context of the assay, typical sites of service, and what to expect from payer coverage descriptions. The publication summarizes benchmarks and policy-relevant considerations for molecular infectious disease testing, highlights clinical utility for outbreak investigations, and notes where input data are incomplete. Data not available in the input are explicitly identified in the introduction and supporting tables.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare87541CPTLegionellamolecular-diagnosticsinfectious-diseaselaboratoryLegionnaires-diseasenucleic-acid-probe

Billing Code Overview

CPT code 87541 describes a laboratory test that detects Legionella pneumophila using an amplified nucleic acid probe technique. The test identifies bacterial nucleic acid sequences specific to L. pneumophila, a pathogen associated with Legionnaires’ disease and outbreaks linked to contaminated facility water and air conditioning systems.

Service type: Molecular diagnostic pathogen detection
Typical site of service: Clinical laboratory or hospital laboratory performing microbiology and molecular diagnostics

Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.

Clinical & Coding Specifications

Clinical Context

A 68-year-old male resident of a long-term care facility presents to the emergency department with fever, productive cough, and new-onset hypoxia. Chest radiograph shows a lobar infiltrate. The patient’s history includes recent maintenance work on the facility cooling tower after several residents developed similar respiratory symptoms. Infection control notifies the laboratory to test respiratory specimens for Legionella species. A lower respiratory tract specimen (sputum or bronchoalveolar lavage) or a validated upper respiratory specimen is collected and sent to the molecular diagnostics laboratory. The laboratory technician performs an amplified nucleic acid probe test specific for Legionella pneumophila per protocol. Results are reported to the ordering clinician and infection prevention team to guide public health reporting and targeted antimicrobial therapy. Typical sites of service include hospital inpatient wards, emergency departments, public health laboratories, and commercial reference laboratories that perform molecular infectious disease testing.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting only the professional (interpretation) portion provided by a physician or qualified professional in a laboratory with split billing.

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Taxonomy Code	Specialty	Notes
`207Q00000X`	Infectious Disease	Physicians who interpret clinical infectious disease testing and manage patient care.
`207R00000X`	Pulmonary Disease	Pulmonologists who order testing for pneumonia etiologies including Legionella.
`362X00000X`	Clinical Laboratory	Laboratory directors and pathologists responsible for molecular diagnostic testing.
`3347C0002X`	Public Health Laboratory	Public health laboratorians performing outbreak investigations and environmental testing.
`208000000X`	Critical Care Medicine	Critical care physicians who manage severely ill patients with suspected Legionnaires’ disease.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J18.9`	Pneumonia, unspecified organism	Common presenting diagnosis when Legionella testing is ordered for community- or healthcare-associated pneumonia.
`J15.9`	Unspecified bacterial pneumonia	Used when bacterial pneumonia is suspected and specific organism testing (including Legionella) is performed.
`A48.1`	Legionnaires' disease	Specific diagnosis for infection with `Legionella pneumophila`; direct indication for this test.
`J12.89`	Other viral pneumonia	May be included in differential diagnosis; testing for Legionella may be ordered when viral causes are not confirmed.
`Z03.818`	Encounter for observation for suspected infectious condition ruled out	Used when patients are evaluated and ruled out; Legionella testing may be part of the evaluation algorithm.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87471`	Infectious agent detection by nucleic acid (DNA or RNA); Legionella pneumophila, amplified probe technique	Alternative CPT for molecular detection of Legionella; may be used depending on payer or lab methodology.
`87476`	Infectious agent detection by nucleic acid (DNA or RNA); Legionella species, amplified probe technique, multiple targets	Used when testing targets multiple Legionella species beyond `L. pneumophila` in outbreak investigations.
`87070`	Culture, bacterial; any other source except urine, blood or stool, aerobic, direct isolate	Performed when culture is attempted in addition to molecular testing to obtain isolates for public health typing.
`87449`	Infectious agent detection by nucleic acid (DNA or RNA); multiple organisms, amplified probe technique	Performed when multiplex molecular panels that include Legionella are run concurrently.
`G0003`	Public health reporting tests (example placeholder)	Used by some payers to denote lab tests reported for public health surveillance; applicability varies by payer and jurisdiction.

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