C06.8Malignant neoplasm of overlapping sites of other and unspecified parts of mouth

C06.8 is the ICD-10-CM diagnosis code for malignant neoplasm of overlapping sites of other and unspecified parts of mouth. It belongs to category C06 (malignant neoplasm of other and unspecified parts of mouth), block C00-C14 (malignant neoplasms of lip, oral cavity and pharynx) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within C06, choose C06.8 (overlapping sites of other and unspecified parts of mouth) only when documentation doesn't support a more specific option: cheek mucosa (C06.0), vestibule of mouth (C06.1), retromolar area (C06.2) and mouth, unspecified (C06.9).

To report this condition, pick the subcode that matches the documentation: C06.80 (mouth) and C06.89 (mouth).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.