C79.82 (Secondary malignant neoplasm of genital organs) compared with D39.2 (Neoplasm of uncertain behavior of placenta), from the official CMS tabular data. C79.82 and D39.2 name the same anatomical site (fetal membrane) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (fetal membrane)
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
Same site, different neoplasm behavior. C79.82 and D39.2 name the same anatomical site (fetal membrane) 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.
| C79.82Secondary malignant neoplasm of genital organs | D39.2Neoplasm of uncertain behavior of placenta | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Secondary malignant neoplasm of genital organs is a billable ICD-10-CM diagnosis code (C79.82). | Neoplasm of uncertain behavior of placenta is a billable ICD-10-CM diagnosis code (D39.2). |
| Includes | — | Chorioadenoma destruens Invasive hydatidiform mole Malignant hydatidiform mole |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources