C04.1 (Malignant neoplasm of lateral floor of mouth) compared with D10.2 (Benign neoplasm of floor of mouth), from the official CMS tabular data. C04.1 and D10.2 name the same anatomical site (mouth) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (mouth)
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source: CMS Table of Neoplasms
Same site, different neoplasm behavior. C04.1 and D10.2 name the same anatomical site (mouth) with a different neoplasm behavior.
From the CMS/CDC Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
| C04.1Malignant neoplasm of lateral floor of mouth | D10.2Benign neoplasm of floor of mouth | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of lateral floor of mouth is a billable ICD-10-CM diagnosis code (C04.1). | Benign neoplasm of floor of mouth is a billable ICD-10-CM diagnosis code (D10.2). |
| Use additional code | code to identify: alcohol abuse and dependence (F10.-) history of tobacco dependence (Z87.891) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources