Summary & Overview
CPT 81515: Molecular PCR Test for Bacterial Vaginosis (Algorithmic Analysis)
CPT code 81515 identifies a molecular diagnostic laboratory test that performs real-time PCR on a vaginal fluid specimen and applies an algorithmic analysis of laboratory and patient data to report a high-likelihood result for bacterial vaginosis (BV). This code captures tests that may also detect co-infections such as Trichomonas vaginalis and Candida species. Its adoption affects clinical workflows for sexually transmitted and vaginitis diagnostics and has implications for laboratory billing, payer coverage policies, and diagnostic stewardship nationwide.
Key payers in typical coverage discussions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical use case for CPT code 81515, typical settings where the test is performed, and what payers commonly consider when adjudicating claims for algorithm-driven molecular assays. The publication summarizes benchmarks and policy context relevant to laboratories and clinicians billing for advanced molecular diagnostics, highlights coding and clinical interpretation considerations tied to BV detection, and explains areas where payers may apply medical necessity criteria or require supporting documentation. Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes is noted as such in detailed sections.
Billing Code Overview
CPT code 81515 describes a molecular diagnostic laboratory test performed on a vaginal fluid specimen that uses real-time polymerase chain reaction (PCR) amplification of DNA markers for specified bacterial species. The laboratory performs algorithmic analysis combining test results and patient data to report a positive or negative result for a high likelihood of bacterial vaginosis (BV). The test may also report detection of additional organisms such as Trichomonas vaginalis and Candida species.
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Service type: Molecular diagnostic laboratory test with algorithmic interpretation
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Typical site of service: Clinical laboratory processing vaginal fluid specimens
Clinical & Coding Specifications
Clinical Context
A 28-year-old woman presents to an outpatient gynecology clinic with a 3-day history of increased vaginal discharge, malodor, and mild pelvic discomfort. The clinician performs a pelvic exam, obtains a vaginal swab specimen, and orders a molecular diagnostic test for bacterial vaginosis that uses real-time PCR amplification of DNA markers with an algorithmic analysis to report a high likelihood of BV and to detect Trichomonas vaginalis and Candida species. The specimen is sent to the laboratory; the lab analyst performs the technical assay, including nucleic acid extraction, real-time PCR amplification for the bacterial targets listed in 81515, and algorithmic interpretation combining patient data and test results to return a result of “positive” or “negative” for high likelihood of BV and presence/absence results for other organisms. Results are reported electronically to the ordering provider, who uses them to confirm diagnosis and guide targeted antimicrobial or antifungal therapy. Typical site of service is an outpatient clinic or ambulatory care setting with specimens processed in a clinical molecular diagnostics laboratory.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional component interpretation of the laboratory result, separate from the technical processing. |