D27 (Benign neoplasm of ovary) compared with D39.1 (Neoplasm of uncertain behavior of ovary), from the official CMS tabular data. D27 and D39.1 name the same anatomical site (corpus) with a different neoplasm behavior.
Same anatomical site, different neoplasm behavior.
Same site — uncertain behavior (corpus)
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. D27 and D39.1 name the same anatomical site (corpus) 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.
| D27Benign neoplasm of ovary | D39.1Neoplasm of uncertain behavior of ovary | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms (C00-D49) | C00-D49 — Neoplasms (C00-D49) |
| Definition | Benign neoplasm of ovary is a non-billable ICD-10-CM category code (D27). | Neoplasm of uncertain behavior of ovary is a non-billable ICD-10-CM category code (D39.1). |
| Use additional code | code to identify any functional activity. | code to identify any functional activity. |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources