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C79.32 vs D49.7

C79.32 (Secondary malignant neoplasm of cerebral meninges) compared with D49.7 (Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system), from the official CMS tabular data. C79.32 and D49.7 name the same anatomical site (arachnoid) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

D49.7
Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system
↔
C79.32
Secondary malignant neoplasm of cerebral meninges

Same anatomical site, different neoplasm behavior.

Same site — secondary malignancy (arachnoid)

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. D49.7 and C79.32 name the same anatomical site (arachnoid) 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

C79.32Secondary malignant neoplasm of cerebral meningesD49.7Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsC00-D49 — Neoplasms
DefinitionSecondary malignant neoplasm of cerebral meninges is a billable ICD-10-CM diagnosis code (C79.32).Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system is a billable ICD-10-CM diagnosis code (D49.7).
Includes—
'growth' NOS
neoplasm NOS
new growth NOS
tumor 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