D33.9 vs D43.9

D33.9 (Benign neoplasm of central nervous system, unspecified) compared with D43.9 (Neoplasm of uncertain behavior of central nervous system, unspecified), from the official CMS tabular data. D33.9 and D43.9 name the same anatomical site (epidural) with a different neoplasm behavior.

Relationship

Informational

Neoplasm table relationship

D33.9

Benign neoplasm of central nervous system, unspecified

↔

D43.9

Neoplasm of uncertain behavior of central nervous system, unspecified

Same anatomical site, different neoplasm behavior.

Same site — uncertain behavior (epidural)

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

Can these codes be reported together?

Same site, different neoplasm behavior. D33.9 and D43.9 name the same anatomical site (epidural) 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.

Side by side

	D33.9Benign neoplasm of central nervous system, unspecified	D43.9Neoplasm of uncertain behavior of central nervous system, unspecified
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Benign neoplasm of central nervous system, unspecified is a billable ICD-10-CM diagnosis code (D33.9).	Neoplasm of uncertain behavior of central nervous system, unspecified is a billable ICD-10-CM diagnosis code (D43.9).
Includes	Benign neoplasm of nervous system (central) NOS	Neoplasm of uncertain behavior of nervous system (central) NOS

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources