Summary & Overview
CPT 87905: Enzymatic Activity Testing for Nonviral Infectious Agents
CPT code 87905 represents the laboratory technical service for assays that measure the enzymatic activity of infectious agents other than viruses. These enzymatic activity tests are used in diagnostic microbiology to identify or characterize bacterial, fungal, parasitic, or other nonviral pathogens and can inform treatment decisions and infection control. Nationally, clear coding of laboratory technical components supports accurate claims processing, appropriate payment for complex lab workflows, and consistent clinical reporting.
Key payers in this coverage overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on the clinical purpose of the assay, the typical site of service (clinical or hospital laboratory), common modifiers associated with lab services, and where to look for related clinical and billing guidance. The publication also outlines benchmarking and policy-relevant considerations for payers and providers, including payment component distinctions and documentation points necessary for claims adjudication.
This summary provides a concise reference for billing specialists, laboratory managers, and policy analysts seeking an overview of CPT code 87905, its clinical role, and payer coverage scope at a national level.
Billing Code Overview
CPT code 87905 describes a laboratory technical service in which a lab analyst performs testing to analyze the enzymatic activity of an infectious agent (other than a virus). This code covers the technical component of enzymatic assays used to detect or quantify enzymatic function associated with bacterial, fungal, parasitic, or other nonviral infectious organisms.
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Service type: Clinical laboratory enzymatic activity assay (technical component)
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Typical site of service: Clinical laboratory or hospital laboratory performing diagnostic microbiology testing
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to an outpatient infectious disease clinic, emergency department, or inpatient ward with suspected bacterial or fungal infection where identification of enzymatic activity of the infectious organism will inform diagnosis or treatment. A clinician collects an appropriate specimen (e.g., bacterial isolate from blood culture, wound swab, respiratory sample, or tissue biopsy) and sends it to the clinical laboratory. In the laboratory, a medical technologist or clinical laboratory scientist performs a biochemical enzymatic assay (such as catalase, coagulase, urease, or other organism-specific enzymatic tests) to characterize the infectious agent. Results are reported to the ordering clinician and used alongside culture, susceptibility testing, molecular diagnostics, and clinical information to guide antimicrobial therapy and infection control decisions. Typical sites of service include hospital laboratories, independent clinical laboratories, and outpatient laboratory facilities.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting the professional (interpretive) component separately from the technical lab work for paired services |
TC |