C51.9 (Malignant neoplasm of vulva, unspecified) compared with D28.0 (Benign neoplasm of vulva), from the official CMS tabular data. C51.9 and D28.0 name the same anatomical site (fourchette) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (fourchette)
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. C51.9 and D28.0 name the same anatomical site (fourchette) 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.
| C51.9Malignant neoplasm of vulva, unspecified | D28.0Benign neoplasm of vulva | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Malignant neoplasm of vulva, unspecified is a billable ICD-10-CM diagnosis code (C51.9). | Benign neoplasm of vulva is a billable ICD-10-CM diagnosis code (D28.0). |
| Includes | malignant neoplasm of skin of female genital organs Malignant neoplasm of external female genitalia NOS Malignant neoplasm of pudendum | adenomatous polyp benign neoplasm of skin of female genital organs benign teratoma |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources