C69.1 (Malignant neoplasm of cornea) compared with C79.49 (Secondary malignant neoplasm of other parts of nervous system), from the official CMS tabular data. C69.1 and C79.49 name the same anatomical site (cornea) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — secondary malignancy (cornea)
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. C69.1 and C79.49 name the same anatomical site (cornea) 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.
| C69.1Malignant neoplasm of cornea | C79.49Secondary malignant neoplasm of other parts of nervous system | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of cornea is a non-billable ICD-10-CM category code (C69.1). | Secondary malignant neoplasm of other parts of nervous system is a billable ICD-10-CM diagnosis code (C79.49). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources