CPT® Code 81300

MSH6 (mutS homolog 6 [E. coli]) (eg, hereditary non-polyposis colorectal cancer, Lynch syndrome) gene analysis; duplication/deletion variants

The CPT® Code 81300 pertains to the molecular genetic testing of the MSH6 gene, specifically focusing on the analysis of duplication and deletion variants. The MSH6 gene is crucial for maintaining genomic stability, as it encodes a protein that is part of a complex responsible for correcting errors that occur during DNA replication. When mutations occur in this gene, they can lead to an increased risk of developing hereditary non-polyposis colorectal cancer (HNPCC), also known as Lynch syndrome. This condition is characterized by a predisposition to various cancers, particularly colorectal and endometrial cancers, as well as other malignancies in organs such as the ovaries, prostate, stomach, and more. The MSH6 gene is located on chromosome 2 and plays a vital role in the DNA mismatch repair system. Mutations in this gene can result in the accumulation of unrepaired DNA errors, which may lead to tumor formation over time. The analysis performed under this code specifically looks for duplication or deletion variants of the MSH6 gene, which can indicate the presence of a genetic predisposition to cancer. Understanding these variants is essential for risk assessment, genetic counseling, and potential clinical management of affected individuals and their families.