C57.4 vs D39.8

C57.4 (Malignant neoplasm of uterine adnexa, unspecified) compared with D39.8 (Neoplasm of uncertain behavior of other specified female genital organs), from the official CMS tabular data. C57.4 and D39.8 name the same anatomical site (adnexa) with a different neoplasm behavior. MedCoder-derived

Relationship

Informational

Neoplasm table relationship

C57.4

Malignant neoplasm of uterine adnexa, unspecified

↔

D39.8

Neoplasm of uncertain behavior of other specified female genital organs

Same anatomical site, different neoplasm behavior.

Same site — uncertain behavior (adnexa)

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. C57.4 and D39.8 name the same anatomical site (adnexa) 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

	C57.4Malignant neoplasm of uterine adnexa, unspecified	D39.8Neoplasm of uncertain behavior of other specified female genital organs
Billing status	Billable	Billable
Classification	C00-D49 — Neoplasms	C00-D49 — Neoplasms
Definition	Malignant neoplasm of uterine adnexa, unspecified is a billable ICD-10-CM diagnosis code (C57.4).	Neoplasm of uncertain behavior of other specified female genital organs is a billable ICD-10-CM diagnosis code (D39.8).
Includes	malignant neoplasm of skin of female genital organs	Neoplasm of uncertain behavior of skin of female genital organs

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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