CPT® Code 81305

MYD88 (myeloid differentiation primary response 88) (eg, Waldenstrom's macroglobulinemia, lymphoplasmacytic leukemia) gene analysis, p.Leu265Pro (L265P) variant

The CPT® Code 81305 pertains to the molecular genetic testing of the MYD88 gene, specifically analyzing the p.Leu265Pro (L265P) variant. This gene is crucial for the immune response, as it encodes a protein that acts as an adapter, facilitating communication between external signals and internal cellular responses. The MYD88 gene is located on the short arm of chromosome 3 at position 22.2 (3p22.2). The identification of the L265P variant is particularly significant in the context of Waldenstrom’s macroglobulinemia and lymphoplasmacytic leukemia, both of which are types of cancers that originate from B lymphocytes. The L265P mutation is an acquired single point mutation that results in the substitution of the amino acid leucine with proline at position 265 of the MYD88 protein. This mutation is found exclusively in the abnormal white blood cells associated with these conditions. Waldenstrom’s macroglobulinemia is characterized by a gradual increase in abnormal white blood cells and an overproduction of immunoglobulin M (IgM), leading to various symptoms such as fatigue, unusual bruising or bleeding, and neurological issues. The testing represented by code 81305 is essential for diagnosing and understanding the underlying genetic factors contributing to these hematological malignancies.