Summary & Overview
CPT 81204: Androgen Receptor Gene Characterization
CPT code 81204 represents a molecular diagnostic test that characterizes alterations in the androgen receptor (AR) gene, including abnormal nucleotide repeat expansions and methylation patterns. Nationally, such testing is important for genetically guided diagnosis and management in conditions where AR gene abnormalities are relevant. Molecular characterization informs clinical decision-making, aids genetic counseling, and supports precision medicine initiatives.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for AR gene testing, payer coverage patterns and common modifiers used with laboratory services, and the typical sites where this testing is performed. The publication also summarizes benchmarking and policy considerations relevant to molecular genetic testing reimbursement and coding practice.
The piece provides practical benchmarks for claim submission, highlights policy updates affecting laboratory CPT coding, and outlines the clinical scenarios that commonly prompt AR gene characterization. Data not available in the input is noted where applicable; the focus remains on national relevance for providers, billing staff, and laboratory administrators seeking clarity on CPT code 81204 and its role in molecular diagnostics.
Billing Code Overview
CPT code 81204 describes a laboratory procedure that characterizes changes in the androgen receptor (AR) gene, typically to detect and characterize abnormal nucleotide repeats or assess methylation status. This test is a molecular genetics assay used to evaluate genetic alterations in the AR gene that can have clinical relevance for diagnosis, prognosis, or therapeutic decision-making.
Service Type: Molecular diagnostic / genetic testing
Typical Site of Service: Clinical laboratory, hospital laboratory, or reference molecular diagnostics lab
Clinical & Coding Specifications
Clinical Context
A middle-aged male presents to a genetics clinic with a history of progressive muscle weakness, family history of X-linked neuromuscular disease, and clinical suspicion for fragile X-associated disorders affecting the androgen receptor (AR) gene. The clinician orders a laboratory molecular diagnostic test to characterize abnormal nucleotide repeats or methylation status of the AR gene to assess for trinucleotide repeat expansions and methylation patterns that explain the phenotype. A peripheral blood sample is collected in the outpatient phlebotomy setting and sent to a molecular diagnostics laboratory. The lab performs DNA extraction, repeat-primed PCR or Southern blot as indicated, and methylation analysis to determine repeat length and methylation status. Results are reported to the ordering clinician; genetic counseling is offered for interpretation and family risk assessment. Typical site of service: outpatient clinic or reference molecular diagnostics laboratory. Service type: molecular pathology / genetic testing (laboratory technical component).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Default primary payer indicator | Rarely used on claims; vendor-specific payer use |
11 | Office or other outpatient visit, normal service |