Malignant neoplasm of vulva (C51) ICD-10-CM
The C51 code range covers malignant neoplasm of vulva with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- carcinoma in situ of vulva D07.1
Codes in the C51 Range 6 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C51 range.
Clitoris
An erectile structure homologous with the penis, situated beneath the anterior labial commissure, partially hidden between the anterior ends of the labia minora.
Pudendal Nerve
A nerve which originates in the sacral spinal cord (S2 to S4) and innervates the PERINEUM, the external GENITALIA, the external ANAL SPHINCTER and the external urethral sphincter. It has three major branches: the perineal nerve, inferior anal nerves, and the dorsal nerve of penis or clitoris.
About the C51 Code Range
The ICD-10 code C51 series is used to identify malignant neoplasms, or cancers, specifically affecting various parts of the vulva. These codes help classify cancers such as those in the labium majus, labium minus, clitoris, overlapping vulvar sites, and unspecified vulvar malignancies.
Each code in the C51 category corresponds to a specific location of vulvar cancer. For example, C51.0 represents malignant tumors of the labium majus, including conditions known as primary carcinoma of Bartholin gland or basal cell carcinoma of the vulva. The code C51.1 is used for cancers of the labium minus, while C51.2 denotes malignant neoplasms of the clitoris. The C51.8 code captures cancers that overlap several vulvar areas. When the cancer location on the vulva is not specified or has complex pathology like Paget's disease or squamous cell carcinoma of anogenital areas, C51.9 is applied. These distinctions in the ICD-10 code for vulvar cancers enable precise diagnosis, reporting, and treatment documentation, supporting healthcare providers and medical coders in accurately categorizing vulvar malignancies based on their site and nature.
Questions About This Page
How many billable codes are in the C51 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C51 range classify?
The range classifies malignant neoplasm of vulva. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
