D35.7 vs D44.9

D35.7 (Benign neoplasm of other specified endocrine glands) compared with D44.9 (Neoplasm of uncertain behavior of unspecified endocrine gland), from the official CMS tabular data. D35.7 and D44.9 name the same anatomical site (endocrine gland) with a different neoplasm behavior.

Relationship

Informational

Neoplasm table relationship

D35.7

Benign neoplasm of other specified endocrine glands

↔

D44.9

Neoplasm of uncertain behavior of unspecified endocrine gland

Same anatomical site, different neoplasm behavior.

Same site — uncertain behavior (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. D35.7 and D44.9 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

	D35.7Benign neoplasm of other specified endocrine glands	D44.9Neoplasm of uncertain behavior of unspecified endocrine gland
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms (C00-D49)	C00-D49 — Neoplasms (C00-D49)
Definition	Benign neoplasm of other specified endocrine glands is a billable ICD-10-CM diagnosis code (D35.7).	Neoplasm of uncertain behavior of unspecified endocrine gland is a billable ICD-10-CM diagnosis code (D44.9).
Use additional code	code to identify any functional activity	—

Edit this comparison Check a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources