CPT 87077: Definitive Identification of Aerobic Isolate
CPT code 87077 represents definitive laboratory identification of an aerobic microbial isolate, typically performed to determine the organism at the species level after a presumptive identification. This test is a key diagnostic step in microbiology that informs targeted antimicrobial therapy, infection control decisions, and public health reporting, making it nationally significant across inpatient and outpatient laboratory settings.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 87077, typical site-of-service considerations, and what stakeholders commonly review when assessing use of the code: coding and billing practice implications, payer coverage patterns, and how the code fits into laboratory service lines. The publication also summarizes benchmarks and policy-relevant updates that affect laboratory coding and reimbursement for organism identification services.
This summary is written for a national audience and focuses on the clinical and billing dimensions of CPT code 87077, providing a practical reference for coders, laboratory managers, and policy analysts. Data not available in the input for detailed payer-specific rates, associated taxonomies, and ICD-10 mappings.
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Billing Code Overview
CPT code 87077 describes laboratory work in which a lab analyst performs additional tests on a presumptively identified aerobic isolate to definitively identify the organism, typically to the species level. This service represents confirmatory or species-level identification following an initial presumptive identification.
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Service type: Microbiological organism identification (definitive/species-level identification)
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Typical site of service: Clinical microbiology laboratory or hospital laboratory performing organism identification from aerobic cultures.
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves an adult hospitalized with a suspected bacterial bloodstream infection. The patient developed fever, leukocytosis, and hemodynamic changes; blood cultures collected in the emergency department grew an aerobic organism on preliminary Gram stain. The laboratory performs initial culture and presumptive identification; when a presumptive aerobic isolate requires definitive identification to the species level, a lab analyst performs additional biochemical, phenotypic, or mass spectrometry testing. The workflow: specimen arrives in microbiology, culture is incubated on appropriate media, colony morphology and Gram stain provide a presumptive ID, then the lab runs confirmatory testing (for example, automated identification panels, MALDI-TOF, or biochemical assays). Results are reported to the ordering clinician and infection prevention; definitive identification can guide targeted antimicrobial therapy and epidemiologic surveillance. Typical site of service is the hospital clinical microbiology laboratory or a reference laboratory supporting inpatient and outpatient facilities.
Coding Specifications
- The following modifiers are most relevant to laboratory identification services and are selected from the provided list. Use the CMS definitions when applying modifiers.
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the professional component of a service if split billing applies (rare for microbiology) |
59 | Distinct procedural service | Use when this identification service is distinct from other lab procedures billed on the same date |
76 | Repeat procedure by same provider | Use if the same definitive ID test is repeated due to prior failure or quality issues |
77 | Repeat procedure by another provider | Use if another laboratory repeats the definitive identification test (note: 77 is not in the provided list; substitute 78 when appropriate) |
78 | Unplanned return to the operating/procedure room by the same physician following initial procedure (lab context atypical) | Generally not applicable; included here only if the listed modifier is applicable in a facility-specific workflow — typically not used for microbiology billing |
90 | Reference lab outside the billing entity | Use when the test is performed by an outside, independent reference laboratory |
91 | Repeat clinical diagnostic laboratory test | Use for repeat testing on a subsequent specimen when clinically indicated |
95 | Synchronous telemedicine service rendered via real-time interactive audio and video | Use if result review and consultation occur via telemedicine (rare for lab-only service) |
TC | Technical component | Use when billing only the technical component of the test (instruments, reagents, technician time) |
QW | CLIA-waived test | Not typical for definitive organism identification; do not use unless the method is CLIA-waived |
90 | (duplicate entry) Reference laboratory outside the billing entity | See above — indicates performance by an external lab |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207RH0000X | Infectious Disease | Physicians ordering and interpreting definitive organism identification for inpatient care |
| 2080P0006X | Pathology | Clinical microbiologists and pathology services overseeing lab processes |
| 207L00000X | Emergency Medicine | ED providers who send cultures and act on identification results |
| 174400000X | Clinical Laboratory | Laboratory technologists and microbiology specialists performing the test |
| 208100000X | Hospitalist | Hospital-based physicians managing patients pending definitive ID |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
R78.81 | Bacteremia | Definitive identification of an aerobic bloodstream isolate is essential for targeted therapy and surveillance |
A41.9 | Sepsis, unspecified organism | Species-level ID guides antimicrobial selection in septic patients |
N39.0 | Urinary tract infection, site not specified | Aerobic isolates from urine cultures may require definitive identification for recurrent or complicated UTI management |
J15.9 | Unspecified bacterial pneumonia | Respiratory isolates that are aerobic may undergo definitive identification to confirm etiologic agent |
L03.90 | Cellulitis, unspecified | Wound or skin aerobic isolates are speciated to guide treatment and infection control |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
87070 | Aerobic culture, bacterial; any other source except urine, with isolation and presumptive identification of isolates | Often performed prior to 87077 when initial culture and presumptive ID are obtained; 87077 represents the additional definitive testing on an aerobic isolate |
87075 | Anaerobic culture, bacterial; any source except urine, with isolation and presumptive identification of isolates | Performed for suspected anaerobic infections; complements aerobic testing when polymicrobial infection is possible |
87101 | Culture, presumptive, pathogenic organisms, identification by any method | Represents organism identification procedures; may be billed in conjunction when different methods are used |
87205 | Smear, primary source with interpretation; Gram or Giemsa stain, bacterial | Initial Gram stain is frequently part of the workflow before definitive identification to direct further testing |
87491 | Infectious agent detection by nucleic acid (e.g., PCR), amplified probe technique; chlamydia trachomatis or neisseria gonorrhoeae (single or multiplex) — example molecular tests | Molecular identification tests may accompany or replace phenotypic 87077 methods for rapid species-level identification |
87140 | Antimicrobial susceptibility testing, identification of organism and susceptibility | Performed after definitive identification to determine antimicrobial sensitivities; follows 87077 in the diagnostic sequence |