Summary & Overview
CPT 81355: VKORC1 Genetic Test, Technical Laboratory Component
CPT code 81355 represents the technical laboratory procedure to detect common variants in the VKORC1 gene, a clinically important molecular test that can influence anticoagulant therapy decisions across diverse patient populations. Nationally, genetic testing for pharmacogenomic markers such as VKORC1 supports precision dosing and can reduce adverse drug events, making the test relevant for laboratories, prescribers, and payers.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides readers with an overview of payer coverage considerations, clinical context for VKORC1 testing, and operational benchmarks for lab-based molecular services. It addresses utilization and reimbursement themes that affect access to testing and outlines common service settings.
Readers will learn the clinical purpose of the test, where it is typically performed, and which payers are commonly involved in coverage decisions. The report summarizes typical service delivery (technical laboratory component), typical site of service (clinical molecular or hospital outpatient laboratory), and available metadata supplied in the input. Data not provided in the input — such as specific coverage policies, ICD-10 mappings, associated taxonomies, and related codes — are noted as not available in the input.
Billing Code Overview
CPT code 81355 describes a laboratory procedure in which a lab analyst performs the technical component of a genetic test to detect common sequence changes in the VKORC1 (vitamin K epoxide reductase complex, subunit 1) gene. This test is used to identify genetic variants that can affect response to anticoagulant medications and influence clinical decision-making related to dosing.
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Service type: Clinical molecular diagnostic testing (technical component)
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Typical site of service: Clinical molecular laboratory or hospital outpatient laboratory setting
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with atrial fibrillation is referred by their cardiologist for pharmacogenetic testing prior to initiation of warfarin therapy. The ambulatory specimen is collected at an outpatient laboratory; the lab analyst performs genomic testing on the VKORC1 gene to detect common single nucleotide polymorphisms that influence warfarin sensitivity. The clinical workflow: the ordering provider documents indication and relevant medications in the electronic health record; the patient signs informed consent for genetic testing; a blood or buccal sample is collected in the outpatient phlebotomy area; the sample is sent to the molecular diagnostics laboratory; laboratory personnel perform DNA extraction, PCR and variant detection for VKORC1 common alleles; results are reviewed by a molecular pathologist and reported to the ordering clinician, who integrates genotype information into dosing decisions and documents results in the chart.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional interpretation component separate from the technical lab work (rare for molecular tests billed by labs). |
90 |