C75.9 vs D49.7

C75.9 (Malignant neoplasm of endocrine gland, unspecified) compared with D49.7 (Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system), from the official CMS tabular data. C75.9 and D49.7 name the same anatomical site (endocrine gland) with a different neoplasm behavior.

Relationship

Informational

Neoplasm table relationship

D49.7

Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system

↔

C75.9

Malignant neoplasm of endocrine gland, unspecified

Same anatomical site, different neoplasm behavior.

Same site — primary malignancy (endocrine gland)

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 C75.9 name the same anatomical site (endocrine gland) 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

	C75.9Malignant neoplasm of endocrine gland, unspecified	D49.7Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Malignant neoplasm of endocrine gland, unspecified is a billable ICD-10-CM diagnosis code (C75.9).	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