D33.0 (Benign neoplasm of brain, supratentorial) compared with D49.6 (Neoplasm of unspecified behavior of brain), from the official CMS tabular data. D33.0 and D49.6 name the same anatomical site (basal ganglia) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — unspecified behavior (basal ganglia)
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. D33.0 and D49.6 name the same anatomical site (basal ganglia) 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.
| D33.0Benign neoplasm of brain, supratentorial | D49.6Neoplasm of unspecified behavior of brain | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of brain, supratentorial is a billable ICD-10-CM diagnosis code (D33.0). | Neoplasm of unspecified behavior of brain is a billable ICD-10-CM diagnosis code (D49.6). |
| Includes | Benign neoplasm of cerebral ventricle Benign neoplasm of cerebrum Benign neoplasm of frontal lobe Benign neoplasm of occipital lobe | 'growth' NOS neoplasm NOS new growth NOS tumor NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources