C51.9 (Malignant neoplasm of vulva, unspecified) compared with D07.1 (Carcinoma in situ of vulva), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1. MedCoder-derived
Not coded here — these two are mutually exclusive.
“carcinoma in situ of vulva (D07.1)”
An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.
Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a
No — do not report together. C51.9 carries an Excludes1 note covering D07.1: “carcinoma in situ of vulva (D07.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
| C51.9Malignant neoplasm of vulva, unspecified | D07.1Carcinoma in situ 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). | Carcinoma in situ of vulva is a billable ICD-10-CM diagnosis code (D07.1). |
| Includes | malignant neoplasm of skin of female genital organs Malignant neoplasm of external female genitalia NOS Malignant neoplasm of pudendum | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources