C71.1 (Malignant neoplasm of frontal lobe) compared with D33.0 (Benign neoplasm of brain, supratentorial), from the official CMS tabular data. C71.1 and D33.0 name the same anatomical site (brain) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (brain)
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. C71.1 and D33.0 name the same anatomical site (brain) 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.
| C71.1Malignant neoplasm of frontal lobe | D33.0Benign neoplasm of brain, supratentorial | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of frontal lobe is a billable ICD-10-CM diagnosis code (C71.1). | Benign neoplasm of brain, supratentorial is a billable ICD-10-CM diagnosis code (D33.0). |
| Includes | — | Benign neoplasm of cerebral ventricle Benign neoplasm of cerebrum Benign neoplasm of frontal lobe Benign neoplasm of occipital lobe |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources