C44.300 (Unspecified malignant neoplasm of skin of unspecified part of face) compared with C79.2 (Secondary malignant neoplasm of skin), from the official CMS tabular data. C44.300 and C79.2 name the same anatomical site (skin) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — secondary malignancy (skin)
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. C44.300 and C79.2 name the same anatomical site (skin) with a different neoplasm behavior.
From the CMS 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.
| C44.300Unspecified malignant neoplasm of skin of unspecified part of face | C79.2Secondary malignant neoplasm of skin | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Unspecified malignant neoplasm of skin of unspecified part of face is a billable ICD-10-CM diagnosis code (C44.300). | Secondary malignant neoplasm of skin is a billable ICD-10-CM diagnosis code (C79.2). |
| Includes | malignant neoplasm of sebaceous glands malignant neoplasm of sweat glands | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources