ICD-10 Code C51.9 – Malignant neoplasm of vulva, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C51.9 – Malignant neoplasm of vulva, unspecified
What it is
C51.9 identifies a malignant tumor of the vulva when the site is not further specified. Use it when the record confirms vulvar cancer but does not name a more exact vulvar subsite.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a vulvar mass, persistent itching, pain, ulceration, bleeding, or a lesion noted on examination.
When to use this code
Use this code when the provider documents vulvar malignancy without specifying the labia majora, labia minora, clitoris, or other vulvar site. It also fits when the pathology or note confirms cancer of the vulva, but the location remains unspecified.
If later documentation identifies a more specific vulvar subsite, code that more precise diagnosis instead. Check documentation for laterality or site details if the record is incomplete.
Do not use for
Do not use C51.9 for benign vulvar lesions, dysplasia, or cancers arising outside the vulva. Do not use it when the chart clearly names a specific vulvar subsite that has its own code.
Coding tip
Query the provider when the vulvar site is unclear, because a more specific code may be available.