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C79.89 vs D37.031

C79.89 (Secondary malignant neoplasm of other specified sites) compared with D37.031 (Neoplasm of uncertain behavior of the sublingual salivary glands), from the official CMS tabular data. C79.89 and D37.031 name the same anatomical site (salivary gland or duct) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

C79.89
Secondary malignant neoplasm of other specified sites
↔
D37.031
Neoplasm of uncertain behavior of the sublingual 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 D37.031 name the same anatomical site (salivary gland or duct) with a different neoplasm behavior.

From the CMS/CDC 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 sitesD37.031Neoplasm of uncertain behavior of the sublingual salivary glands
Billing statusBillableBillable
ClassificationC00-D49 — Neoplasms (C00-D49)C00-D49 — Neoplasms (C00-D49)
DefinitionSecondary malignant neoplasm of other specified sites is a billable ICD-10-CM diagnosis code (C79.89).Neoplasm of uncertain behavior of the sublingual salivary glands is a billable ICD-10-CM diagnosis code (D37.031).
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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