C44.390 (Other specified malignant neoplasm of skin of unspecified parts of face) compared with D48.5 (Neoplasm of uncertain behavior of skin), from the official CMS tabular data. C44.390 and D48.5 name the same anatomical site (columnella) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (columnella)
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. C44.390 and D48.5 name the same anatomical site (columnella) 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.
| C44.390Other specified malignant neoplasm of skin of unspecified parts of face | D48.5Neoplasm of uncertain behavior of skin | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Other specified malignant neoplasm of skin of unspecified parts of face is a billable ICD-10-CM diagnosis code (C44.390). | Neoplasm of uncertain behavior of skin is a billable ICD-10-CM diagnosis code (D48.5). |
| Includes | malignant neoplasm of sebaceous glands malignant neoplasm of sweat glands | Neoplasm of uncertain behavior of anal margin Neoplasm of uncertain behavior of anal skin Neoplasm of uncertain behavior of perianal skin Neoplasm of uncertain behavior of skin of breast |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources