C79.89 vs D36.16

C79.89 (Secondary malignant neoplasm of other specified sites) compared with D36.16 (Benign neoplasm of peripheral nerves and autonomic nervous system of pelvis), from the official CMS tabular data. C79.89 and D36.16 name the same anatomical site (lumbosacral plexus) with a different neoplasm behavior.

Relationship

Informational

Neoplasm table relationship

C79.89

Secondary malignant neoplasm of other specified sites

↔

D36.16

Benign neoplasm of peripheral nerves and autonomic nervous system of pelvis

Same anatomical site, different neoplasm behavior.

Same site — benign neoplasm (lumbosacral plexus)

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. C79.89 and D36.16 name the same anatomical site (lumbosacral plexus) 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

	C79.89Secondary malignant neoplasm of other specified sites	D36.16Benign neoplasm of peripheral nerves and autonomic nervous system of pelvis
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Secondary malignant neoplasm of other specified sites is a billable ICD-10-CM diagnosis code (C79.89).	Benign neoplasm of peripheral nerves and autonomic nervous system of pelvis is a billable ICD-10-CM diagnosis code (D36.16).

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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