D32.0 (Benign neoplasm of cerebral meninges) compared with D42.0 (Neoplasm of uncertain behavior of cerebral meninges), from the official CMS tabular data. D32.0 and D42.0 name the same anatomical site (arachnoid) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (arachnoid)
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. D32.0 and D42.0 name the same anatomical site (arachnoid) 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.
| D32.0Benign neoplasm of cerebral meninges | D42.0Neoplasm of uncertain behavior of cerebral meninges | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of cerebral meninges is a billable ICD-10-CM diagnosis code (D32.0). | Neoplasm of uncertain behavior of cerebral meninges is a billable ICD-10-CM diagnosis code (D42.0). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources