C79.2 (Secondary malignant neoplasm of skin) compared with D23.1 (Other benign neoplasm of skin of eyelid, including canthus), from the official CMS tabular data. C79.2 and D23.1 name the same anatomical site (canthus) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (canthus)
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. C79.2 and D23.1 name the same anatomical site (canthus) 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.
| C79.2Secondary malignant neoplasm of skin | D23.1Other benign neoplasm of skin of eyelid, including canthus | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Secondary malignant neoplasm of skin is a billable ICD-10-CM diagnosis code (C79.2). | Other benign neoplasm of skin of eyelid, including canthus is a non-billable ICD-10-CM category code (D23.1). |
| Includes | — | benign neoplasm of hair follicles benign neoplasm of sebaceous glands benign 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