CPT® Code 81201

The CPT® Code 81201 pertains to the molecular genetic testing of the adenomatous polyposis coli (APC) gene, specifically focusing on the full gene sequence analysis. This testing is crucial for identifying mutations within the APC gene that are responsible for familial adenomatosis polyposis (FAP), a hereditary condition characterized by the development of numerous polyps in the colon and rectum, which can lead to colorectal cancer if left untreated. FAP is inherited in an autosomal dominant manner, meaning that an individual only needs to inherit the mutated gene from one parent to be affected by the condition. The classic form of FAP is typically more severe than its attenuated counterpart, which presents with fewer polyps and a later onset of symptoms. The APC gene plays a vital role as a tumor suppressor, and mutations in this gene disrupt its function, leading to uncontrolled cell growth and polyp formation. The gene is located on chromosome 5, and over 700 distinct mutations have been documented, often resulting in a truncated, nonfunctional APC protein. The testing process may involve comprehensive gene sequencing, which is specifically reported under code 81201, allowing for the identification of various mutations, including those that may be linked to other syndromes such as Turcot syndrome. Additionally, the APC gene has known variants, such as the I1307K mutation prevalent in the Ashkenazi Jewish population, which is associated with an increased risk of colon cancer. Understanding these genetic factors is essential for risk assessment and management in affected individuals and their families.