Summary & Overview
CPT 0411U: IDgenetix® Pharmacogenomic Test for Psychotropic Medication Management
CPT code 0411U designates a Proprietary Laboratory Analyses (PLA) test specific to IDgenetix® from Castle Biosciences Inc., a pharmacogenomic assay that analyzes 15 genes from a buccal swab to inform psychotropic medication choices by flagging potential drug–drug and drug–gene interactions. As a PLA code, 0411U is unique to this one test and signals that payers and clinicians are addressing an emerging, commercially owned diagnostic with individualized clinical utility. Nationally, the code matters because pharmacogenomic testing for mental health medications is a growing area of precision medicine with implications for medication safety, prescribing efficiency, and utilization management.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise national overview of the code’s clinical purpose, typical sites of service, and the service type. The publication also outlines payer coverage landscape and common billing practices, summarizes available benchmarks where present, and highlights policy and coding considerations relevant to laboratories, clinicians, and billing teams. Data not available in the input will be identified explicitly in relevant sections.
Billing Code Overview
CPT code 0411U is a Proprietary Laboratory Analyses (PLA) code that applies only to a single, manufacturer-specific test: IDgenetix® from Castle Biosciences Inc. The assay analyzes 15 genes from a buccal (cheek) swab specimen and uses an algorithmic analysis to generate a report listing all psychotropic medications with indications of potential drug–drug interactions and drug–gene interactions for the patient.
Service Type: Genetic/pharmacogenomic testing for psychotropic medication management
Typical Site of Service: Clinical laboratory or ambulatory collection site (buccal swab collected in outpatient or office settings and sent to the performing laboratory).
Clinical & Coding Specifications
Clinical Context
A 35-year-old adult with a history of major depressive disorder and partial response to multiple antidepressant trials presents to a psychiatric clinic for medication optimization. The treating psychiatrist orders the IDgenetix® pharmacogenomic test (reportable with CPT code 0411U) to analyze 15 genes from a buccal swab specimen. The lab performs genotyping and an algorithmic review that cross-references the patient’s gene variants with psychotropic medications, producing a report that lists all psychotropic medications with indicated gene–drug and drug–drug interaction concerns. Typical clinical workflow: the clinician collects a buccal swab during an outpatient behavioral health visit or sends a test kit to the patient; the sample is shipped to the testing laboratory; the laboratory performs the proprietary analysis and returns an actionable report to the ordering clinician; the clinician reviews the report to inform medication selection or dosing decisions and documents results in the medical record.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier — standard billing | Use when no special circumstance applies to the laboratory test billing. |
26 |