CPT® Code 81163

BRCA1 (BRCA1, DNA repair associated), BRCA2 (BRCA2, DNA repair associated) (eg, hereditary breast and ovarian cancer) gene analysis; full sequence analysis

The CPT® Code 81163 pertains to the full sequence analysis of the BRCA1 and BRCA2 genes, which are critical components in the study of hereditary breast and ovarian cancer. The BRCA1 gene is located on chromosome 17, while the BRCA2 gene is found on chromosome 13. Both genes function as tumor suppressors, playing a vital role in preventing uncontrolled cell growth and ensuring the accurate repair of chromosomal damage, particularly in the context of DNA double strand breaks. When mutations occur in these genes, their ability to repair damaged DNA is compromised, leading to unchecked cellular proliferation. This malfunction is significantly associated with an elevated risk of developing early-onset breast and ovarian cancers in females, as well as certain other cancers in both males and females. The prevalence of mutations in the BRCA1 and BRCA2 genes is notably higher in specific populations, including those of Norwegian, Dutch, Icelandic, and Ashkenazi Jewish descent. Molecular genetic testing, such as that represented by CPT® Code 81163, is instrumental in identifying these hereditary cancer risks, guiding appropriate treatment options, and determining which family members may also be at risk. The full sequence analysis conducted under this code involves a comprehensive examination of the gene segments to identify any mutations or variations. This process includes the study of active and post-translational modification sites, gene structures, the distribution of introns and exons, and regulatory elements. Additionally, genetic markers can be identified through the detection of point mutations or single nucleotide polymorphisms. In cases where the sequence analysis does not reveal any variants, a full duplication/deletion analysis may be necessary to uncover large gene rearrangements. The normal genetic structure should present two copies of each gene per cell, except for sex chromosomes; thus, the presence of zero or one copy indicates a deletion variant, while three or more copies suggest a duplication variant. It is important to note that CPT® Code 81163 specifically reports the full sequence analysis, distinguishing it from other codes that may focus on different aspects of genetic testing for the BRCA genes.