2027 ICD-10-CM Diagnosis Code C51Malignant neoplasm of vulva

ICD-10-CM Codes›C00–D49›C51-C58›C51

ICD-10-CM C51
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

C51 is a non-billable ICD-10-CM category code for malignant neoplasm of vulva, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C51.0, C51.1, C51.2, and C51.8.

Code Identity

ICD-10-CM Code
C51
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of vulva
Short Description
Malignant neoplasm of vulva
Same as the full description in the CMS dataset.
Chapter
C51-C58
Malignant neoplasms of female genital organs

Code Classification

ChapterC00–D49Neoplasms
SectionC51-C58Malignant neoplasms of female genital organs
CategoryC51Malignant neoplasm of vulva
This CodeC51Malignant neoplasm of vulva

Specific Coding for Malignant neoplasm of vulvaOverview

Non-specific codes like C51 require more characters. Use one of these billable codes instead:

  • Use C51.0 for Malignant neoplasm of labium majus

  • Use C51.1 for Malignant neoplasm of labium minus

  • Use C51.2 for Malignant neoplasm of clitoris

  • Use C51.8 for Malignant neoplasm of overlapping sites of vulva

  • Use C51.9 for Malignant neoplasm of vulva, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to C51: its own notes plus those printed at block C51-C58 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block C51-C58 Malignant neoplasms of female genital organs applies to 36 codes
  • malignant neoplasm of skin of female genital organs

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • carcinoma in situ of vulva (D07.1)

Notes

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name C51, its category, or a range that includes it.

Applicable To 2

These notes mention C51.

  • Z80.4 Family history of malignant neoplasm of genital organs
    Conditions classifiable to C51-C63
  • Z85.4 Personal history of malignant neoplasm of genital organs
    Conditions classifiable to C51-C63

Excludes1 1

These codes carry an Excludes1 note naming C51: they are not reported together with it, unless the two conditions are unrelated.

  • C44 Other and unspecified malignant neoplasm of skin
    malignant neoplasm of skin of genital organs (C51-C52, C60.-, C63.2)

Excludes2 1

These codes carry an Excludes2 note naming C51: its condition is not part of those codes, and both may be reported when the patient has both.

  • C43 Malignant melanoma of skin
    malignant melanoma of skin of genital organs (C51-C52, C60.-, C63.-)

Clinical InformationClinical

  • Malignant Vulvar Neoplasm

    a primary or metastatic malignant neoplasm involving the vulva.

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About C51Overview

What is the ICD-10 code for malignant neoplasm of vulva?

C51 is the ICD-10-CM category for malignant neoplasm of vulva, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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

No. This is a category header that groups the codes for malignant neoplasm of vulva, and headers cannot be submitted on claims. Claims for malignant neoplasm of vulva need a more specific code from this category, such as C51.0, C51.1, and C51.2.

Can C51 be reported with D07.1?

Not as a rule. The Excludes1 note on C51 lists "carcinoma in situ of vulva (D07.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).