C79.49 (Secondary malignant neoplasm of other parts of nervous system) compared with D31.5 (Benign neoplasm of lacrimal gland and duct), from the official CMS tabular data. C79.49 and D31.5 name the same anatomical site (lacrimal) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — secondary malignancy (lacrimal)
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. D31.5 and C79.49 name the same anatomical site (lacrimal) 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.
| C79.49Secondary malignant neoplasm of other parts of nervous system | D31.5Benign neoplasm of lacrimal gland and duct | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Secondary malignant neoplasm of other parts of nervous system is a billable ICD-10-CM diagnosis code (C79.49). | Benign neoplasm of lacrimal gland and duct is a non-billable ICD-10-CM category code (D31.5). |
| Includes | — | Benign neoplasm of lacrimal sac Benign neoplasm of nasolacrimal duct |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources