CPT 87279: Parainfluenza Antigen Detection by Immunofluorescence

CPT code 87279 represents a laboratory immunofluorescent assay to detect antigens of a single Parainfluenza virus type. This targeted diagnostic test supports rapid identification of parainfluenza infection, informing clinical management and infection control decisions in hospitals and outpatient laboratories. Nationally, accurate coding of antigen detection procedures is important for claims adjudication, epidemiologic surveillance, and resource planning.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for antigen-based parainfluenza testing, common sites of service, and the role of this procedure in diagnostic workflows. The publication also summarizes typical coverage considerations and coding-related administrative notes relevant to laboratory services.

This report provides benchmarks and coding guidance context, highlights any recent policy updates affecting laboratory diagnostic billing where available, and explains how CPT code 87279 fits within broader viral testing strategies. Data not available in the input is noted where applicable.

Billing Code Overview

CPT code 87279 describes a laboratory procedure in which a lab analyst detects antigens of a single type of Parainfluenza virus using immunofluorescent antibody staining and fluorescence microscopy. This is a targeted viral antigen detection assay performed by trained laboratory personnel.

Service type: Laboratory diagnostic test — antigen detection using immunofluorescence
Typical site of service: Clinical laboratory or hospital laboratory with fluorescence microscopy capability

Clinical Context

A typical patient is a pediatric or adult presenting to an outpatient clinic, urgent care, emergency department, or hospital laboratory with acute respiratory symptoms such as fever, cough, nasal congestion, sore throat, wheeze, or increased work of breathing during parainfluenza season. A clinician collects a nasopharyngeal swab or aspirate and sends the specimen to the clinical laboratory. A microbiology technologist or lab analyst performs an antigen detection test for a single type of Parainfluenza virus using an immunofluorescent antibody (IFA) stain and fluorescence microscopy. Results are documented in the laboratory information system and communicated to the ordering clinician to guide infection control, cohorting, antiviral decisions, or further molecular testing if needed.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only for the professional interpretation and report of the immunofluorescent test separate from the technical component.
`TC`	Technical component	Use when billing only for the technical component (laboratory processing, staining, microscopy) and not the professional interpretation.

Taxonomy Code	Specialty	Notes
363L00000X	Clinical Laboratory Technologist/Technician	Performs specimen processing, staining, and microscopy in hospital or reference labs.
2080P0200X	Pediatric Infectious Disease	Orders testing commonly for hospitalized children with respiratory illness.
207Q00000X	Infectious Disease	Orders and interprets results for adult and immunocompromised patients.
207R00000X	Pathology	May oversee laboratory quality, interpretation, and reporting of virology studies.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`J00`	Acute nasopharyngitis (common cold)	Upper respiratory symptoms prompting viral testing; parainfluenza can present similarly.
`J02.9`	Acute pharyngitis, unspecified	Sore throat presentations where respiratory viral testing may be performed.
`J12.1`	Pneumonia due to respiratory syncytial virus	Viral pneumonia differential; parainfluenza may cause similar lower respiratory disease, especially in infants.
`J20.8`	Acute bronchitis due to other specified organisms	Bronchitis presentations in which parainfluenza is a causative agent.
`J21.0`	Acute bronchiolitis due to respiratory syncytial virus	Bronchiolitis clinical syndrome common in infants; parainfluenza also causes bronchiolitis and is tested for.
`B97.4`	Parainfluenza virus as the cause of diseases classified elsewhere	Used when parainfluenza is identified as the etiologic agent for a respiratory illness.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`87279`	Infectious agent antigen detection by immunofluorescent stain for a single type of virus (Parainfluenza)	Primary code describing the laboratory immunofluorescent antigen detection procedure performed by the lab analyst.
`87274`	Infectious agent antigen detection by immunofluorescent stain, multiple types or multiple agents	Performed when a multiplex immunofluorescent panel is run instead of a single-agent test; may be ordered when broad respiratory virus evaluation is needed.
`87804`	Infectious agent antigen detection by rapid immunoassay with direct optical observation	May be performed as an alternative rapid antigen test for respiratory viruses in point-of-care settings.
`87400`	Infectious agent antigen detection by enzyme immunoassay technique (EIA) for respiratory virus	Used when an EIA method is used instead of immunofluorescence for antigen detection.
`87420`	Infectious agent antigen detection by NAA with probe technique	Performed when molecular amplification testing (NAA) is ordered following or instead of antigen testing for greater sensitivity.

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Summary & Overview