Malignant neoplasm of base of tongue

**Inclusion terms:** - Malignant neoplasm of dorsal surface of base of tongue - Malignant neoplasm of fixed part of tongue NOS - Malignant neoplasm of posterior third of tongue

**Use additional code:** - code to identify: - alcohol abuse and dependence (F10.-) - history of tobacco dependence (Z87.891) - tobacco dependence (F17.-) - tobacco use (Z72.0)