C79.89 vs D37.04

C79.89 (Secondary malignant neoplasm of other specified sites) compared with D37.04 (Neoplasm of uncertain behavior of the minor salivary glands), from the official CMS tabular data. C79.89 and D37.04 name the same anatomical site (salivary gland or duct) with a different neoplasm behavior.

Relationship

Informational

Neoplasm table relationship

C79.89

Secondary malignant neoplasm of other specified sites

↔

D37.04

Neoplasm of uncertain behavior of the minor salivary glands

Same anatomical site, different neoplasm behavior.

Same site — uncertain behavior (salivary gland or duct)

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 D37.04 name the same anatomical site (salivary gland or duct) 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	D37.04Neoplasm of uncertain behavior of the minor salivary glands
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms	C00-D49 — Neoplasms
Definition	Secondary malignant neoplasm of other specified sites is a billable ICD-10-CM diagnosis code (C79.89).	Neoplasm of uncertain behavior of the minor salivary glands is a billable ICD-10-CM diagnosis code (D37.04).
Includes	—	Neoplasm of uncertain behavior of submucosal salivary glands of lip Neoplasm of uncertain behavior of submucosal salivary glands of cheek Neoplasm of uncertain behavior of submucosal salivary glands of hard palate Neoplasm of uncertain behavior of submucosal salivary glands of soft palate

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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