Summary & Overview
CPT 81205: BCKDHB Gene Testing, Technical Laboratory Test
CPT code 81205 represents the technical component of molecular diagnostic testing for common variants in the BCKDHB gene, which encodes the branched–chain keto acid dehydrogenase E1 beta polypeptide. This test is a targeted genetic assay used in clinical laboratories to identify variants linked to branched-chain amino acid metabolism disorders; it informs diagnostic workups for suspected inherited metabolic conditions and can impact clinical management and genetic counseling.
Key national payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical context and common sites of service, benchmarking information where available, and notes on coding context relevant to laboratory and molecular diagnostic service lines. The publication summarizes reimbursement and coverage considerations at a national level, highlights coding relationships within molecular diagnostics, and provides a concise reference for billing staff, laboratory managers, and policy analysts.
Data not available in the input for some items such as associated taxonomies, ICD-10 diagnoses, and related codes; those fields are omitted when not provided.
Billing Code Overview
CPT code 81205 describes a technical laboratory test performed to detect common changes in the gene for branched–chain keto acid dehydrogenase E1, beta polypeptide (BCKDHB). The service involves laboratory analysis of patient specimens to identify genetic variants associated with disorders of branched-chain amino acid metabolism.
Service Type: Genetic molecular diagnostic testing (technical component)
Typical Site of Service: Clinical laboratory or reference diagnostic laboratory
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Clinical & Coding Specifications
Clinical Context
A neonate or infant with poor feeding, vomiting, lethargy, hypotonia, and an elevated newborn screen for branched-chain aminoacidopathies is referred for confirmatory genetic testing. A pediatric metabolic specialist orders molecular testing for the BCKDHB gene to detect common pathogenic variants causing maple syrup urine disease (MSUD). Blood is drawn at an outpatient phlebotomy clinic or inpatient pediatric unit and sent to a clinical molecular genetics laboratory. The lab analyst performs the technical sequencing or targeted variant analysis described by 81205. Results are reported to the ordering clinician and incorporated into the metabolic management plan, which may include urgent dietary modification, metabolic stabilization, and genetic counseling for the family.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation component if the laboratory separates technical and professional components and the ordering provider or consultant bills for interpretation. |
TC | Technical component |