C06.89 vs C14.8
C06.89 (Malignant neoplasm of overlapping sites of other parts of mouth) compared with C14.8 (Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. C14.8 carries an Excludes1 note covering C06.89: “'book leaf' neoplasm [ventral surface of tongue and floor of mouth] (C06.89)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| C06.89Malignant neoplasm of overlapping sites of other parts of mouth | C14.8Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of overlapping sites of other parts of mouth is a billable ICD-10-CM diagnosis code (C06.89). | Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx is a billable ICD-10-CM diagnosis code (C14.8). |
| Includes | 'book leaf' neoplasm [ventral surface of tongue and floor of mouth] | Primary malignant neoplasm of two or more contiguous sites of lip, oral cavity and pharynx |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) history of tobacco dependence (Z87.891) | code to identify: alcohol abuse and dependence (F10.-) exposure to environmental tobacco smoke (Z77.22) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources