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C79.89 vs D15.7

C79.89 (Secondary malignant neoplasm of other specified sites) compared with D15.7 (Benign neoplasm of other specified intrathoracic organs), from the official CMS tabular data. C79.89 and D15.7 name the same anatomical site (intrathoracic) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

C79.89
Secondary malignant neoplasm of other specified sites
↔
D15.7
Benign neoplasm of other specified intrathoracic organs

Same anatomical site, different neoplasm behavior.

Same site — benign neoplasm (intrathoracic)

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 D15.7 name the same anatomical site (intrathoracic) 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 sitesD15.7Benign neoplasm of other specified intrathoracic organs
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsC00-D49 — Neoplasms
DefinitionSecondary malignant neoplasm of other specified sites is a billable ICD-10-CM diagnosis code (C79.89).Benign neoplasm of other specified intrathoracic organs is a billable ICD-10-CM diagnosis code (D15.7).
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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