C70.1 (Malignant neoplasm of spinal meninges) compared with D32.1 (Benign neoplasm of spinal meninges), from the official CMS tabular data. C70.1 and D32.1 name the same anatomical site (arachnoid) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (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. C70.1 and D32.1 name the same anatomical site (arachnoid) 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.
| C70.1Malignant neoplasm of spinal meninges | D32.1Benign neoplasm of spinal meninges | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Malignant neoplasm of spinal meninges is a billable ICD-10-CM diagnosis code (C70.1). | Benign neoplasm of spinal meninges is a billable ICD-10-CM diagnosis code (D32.1). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources