C71.1 (Malignant neoplasm of frontal lobe) compared with D43.0 (Neoplasm of uncertain behavior of brain, supratentorial), from the official CMS tabular data. C71.1 and D43.0 name the same anatomical site (brain) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (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 D43.0 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 | D43.0Neoplasm of uncertain behavior 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). | Neoplasm of uncertain behavior of brain, supratentorial is a billable ICD-10-CM diagnosis code (D43.0). |
| Includes | — | Neoplasm of uncertain behavior of cerebral ventricle Neoplasm of uncertain behavior of cerebrum Neoplasm of uncertain behavior of frontal lobe Neoplasm of uncertain behavior 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