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 of tobacco use (Z87.891)
 * tobacco dependence (F17.-)
 * tobacco use (Z72.0)
 * C03.0 Malignant neoplasm of upper gum
 * C03.1 Malignant neoplasm of lower gum
 * C03.9 Malignant neoplasm of gum, unspecified

C04 Malignant neoplasm of floor of mouth

 * Use additional code to identify:
 * alcohol abuse and dependence (F10.-)
 * history of tobacco use (Z87.891)
 * tobacco dependence (F17.-)
 * tobacco use (Z72.0)
 * C04.0 Malignant neoplasm of anterior floor of mouth
 * Malignant neoplasm of anterior to the premolar-canine junction
 * C04.1 Malignant neoplasm of lateral floor of mouth
 * C04.8 Malignant neoplasm of overlapping sites of floor of mouth
 * C04.9 Malignant neoplasm of floor of mouth, unspecified

C05 Malignant neoplasm of palate

 * Excludes1: Kaposi's sarcoma of palate (C46.2)
 * Use additional code to identify:
 * alcohol abuse and dependence (F10.-)
 * history of tobacco use (Z87.891)
 * tobacco dependence (F17.-)
 * tobacco use (Z72.0)
 * C05.0 Malignant neoplasm of hard palate
 * C05.1 Malignant neoplasm of soft palate
 * Excludes2: malignant neoplasm of nasopharyngeal surface of soft palate (C11.3)
 * C05.2 Malignant neoplasm of uvula
 * C05.8 Malignant neoplasm of overlapping sites of palate
 * C05.9 Malignant neoplasm of palate, unspecified
 * Malignant neoplasm of roof of mouth

C06 Malignant neoplasm of other and unspecified parts of mouth

 * Use additional code to identify:
 * alcohol abuse and dependence (F10.-)
 * history of tobacco use (Z87.891)
 * tobacco dependence (F17.-)
 * tobacco use (Z72.0)
 * C06.0 Malignant neoplasm of cheek mucosa
 * Malignant neoplasm of buccal mucosa NOS
 * Malignant neoplasm of internal cheek
 * C06.1 Malignant neoplasm of vestibule of mouth
 * Malignant neoplasm of buccal sulcus (upper) (lower)
 * Malignant