2026 ICD-10-CM Diagnosis Code C51.2Malignant neoplasm of clitoris

ICD-10-CM Codes›C00–D49›C51-C58›C51

ICD-10-CM C51.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C51.2 is a billable ICD-10-CM diagnosis code for malignant neoplasm of clitoris. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 736 through 741, 754 through 756. Coders also document this condition as lesion of clitoris. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Female reproductive system cancers - all other types.

Code Identity

ICD-10-CM Code
C51.2
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of clitoris
Short Description
Malignant neoplasm of clitoris
Same as the full description in the CMS dataset.
Parent Code
C51
Malignant neoplasm of vulva

Code Classification

ChapterC00–D49Neoplasms
SectionC51-C58Malignant neoplasms of female genital organs
CategoryC51Malignant neoplasm of vulva
This CodeC51.2Malignant neoplasm of clitoris

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Lesion of clitoris
  • Malignant neoplasm of clitoris
  • Neoplasm of clitoris
  • Primary malignant neoplasm of clitoris

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO038
Female reproductive system cancers - all other types
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • 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.

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
clitorisC51.2C79.82D07.1D28.0D39.8D49.59
skin NOS › clitorisC51.2C79.82D07.1D28.0D39.8D49.59
skin NOS › female genital organs (external) › clitorisC51.2C79.82D07.1D28.0D39.8D49.59

Patient EducationClinical

Vulvar Cancer

Vulvar cancer is a rare type of cancer. It forms in a woman's external genitals, called the vulva. The cancer usually grows slowly over several years. First, precancerous cells grow on vulvar skin. This is called vulvar intraepithelial neoplasia (VIN), or dysplasia. Not all VIN cases turn into cancer, but it is best to treat it early.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert C51.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
184.3 Malign neopl clitoris
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C51.2Overview

Is C51.2 (Malignant neoplasm of vulva) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of clitoris on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C51.2 group to?

When malignant neoplasm of clitoris is the principal diagnosis on an inpatient stay, it groups to MS-DRG 736, 737, 738, 739, 740, 741, 754, 755, 756, with relative weights from 0.9605 to 3.5745 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C51.2?

Under the General Equivalence Mappings, malignant neoplasm of clitoris converts to ICD-9-CM 184.3 (malign neopl clitoris). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.