Summary & Overview
CPT 87158: Advanced Organism Characterization by Laboratory Analysis
CPT code 87158 represents an advanced laboratory analysis performed on a previously isolated and identified organism using methods other than those listed in 87140–87153 to further categorize the organism, such as to the taxonomic type level. This code supports precise organism characterization that can inform clinical decision-making, infection control, public health surveillance, and antimicrobial stewardship. Nationally, such specialized microbiology services are important for accurate diagnosis of infectious diseases and for guiding targeted therapy.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for 87158, descriptions of typical service settings (clinical and hospital laboratories), and the types of benchmarks and policy considerations commonly associated with advanced microbiology billing. The publication summarizes reimbursement and billing-related themes, common modifier usage, and where 87158 fits relative to related organism identification and susceptibility codes. It also outlines implications for laboratory workflows and documentation expectations. Data not available in the input, such as payer-specific rates, associated taxonomies, and ICD-10 pairings, are noted as unavailable where applicable.
Billing Code Overview
CPT code 87158 describes a laboratory service in which a lab analyst performs an analysis, using any method not listed in 87140–87153, on a previously isolated and identified organism to further categorize the organism, for example to the taxonomic level of type. This service is a specialized microbiology or infectious disease laboratory procedure focused on organism characterization rather than initial isolation or identification.
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Service type: Organism characterization / advanced microbiology testing
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Typical site of service: Clinical laboratory or hospital laboratory with microbiology capabilities
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult hospitalized for a complicated bacterial infection in which a cultured organism has been isolated and initially identified (for example, a nonfermenting gram-negative bacillus or unusual streptococcal species). The treating team requests further subtyping to the taxonomic level of type (for epidemiology, infection control, outbreak investigation, or antimicrobial stewardship). A clinical laboratory analyst receives the previously isolated and identified organism and performs a specialized analysis using methods not listed in codes 87140–87153 (for example, advanced phenotypic assays or specific antigenic typing assays). The workflow includes: receipt of the isolate, review of prior identification and susceptibility data, performance of the specialized assay, documentation of results in the laboratory information system, and communication of the refined taxonomic categorization to the ordering clinician and infection control.
Typical site of service: hospital clinical microbiology laboratory, public health laboratory, or reference laboratory.
Typical patient scenario: a 68-year-old inpatient with healthcare-associated pneumonia from whom a sputum culture yielded an uncommon Pseudomonas isolate; initial ID in the hospital lab indicates a Pseudomonas species and the clinician requests further typing to determine type/strain for outbreak tracking and therapeutic guidance. The laboratory performs the specified non-listed method to categorize the organism more specifically and reports the type-level result to the clinical team and infection prevention staff.
Coding Specifications
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