CPT code 81272 describes a laboratory technical service for a partial gene sequence analysis of the v-kit (KIT) gene, targeting specific exons (commonly including exons 8, 11, 13, 17, 18) rather than sequencing the entire gene; the service is a molecular diagnostic test typically performed by a clinical molecular diagnostics laboratory and reported as a technical component for specimens collected in outpatient clinics, hospital labs, or reference laboratory settings.