D33.3 (Benign neoplasm of cranial nerves) compared with D43.3 (Neoplasm of uncertain behavior of cranial nerves), from the official CMS tabular data. D33.3 and D43.3 name the same anatomical site (acoustic nerve) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (acoustic nerve)
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. D33.3 and D43.3 name the same anatomical site (acoustic nerve) 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.
| D33.3Benign neoplasm of cranial nerves | D43.3Neoplasm of uncertain behavior of cranial nerves | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of cranial nerves is a billable ICD-10-CM diagnosis code (D33.3). | Neoplasm of uncertain behavior of cranial nerves is a billable ICD-10-CM diagnosis code (D43.3). |
| Includes | Benign neoplasm of olfactory bulb | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources