2024 ICD-10-CM Diagnosis Code C51.9

Malignant neoplasm of vulva, unspecified

ICD-10-CM Code:
C51.9
ICD-10 Code for:
Malignant neoplasm of vulva, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

Code Classification

  • Neoplasms
    (C00–D49)
    • Malignant neoplasms of female genital organs
      (C51-C58)
      • Malignant neoplasm of vulva
        (C51)

C51.9 is a billable diagnosis code used to specify a medical diagnosis of malignant neoplasm of vulva, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

This code is applicable to female patients only. It is clinically and virtually impossible to use this code on a non-female patient.

The following anatomical sites found in the Table of Neoplasms reference this diagnosis code given the correct histological behavior: Neoplasm, neoplastic fourchette ; Neoplasm, neoplastic labia (skin) ; Neoplasm, neoplastic labium (skin) ; Neoplasm, neoplastic mons ; Neoplasm, neoplastic mons pubis ; Neoplasm, neoplastic mons veneris ; Neoplasm, neoplastic pudenda, pudendum (femaie) ; etc

Unspecified diagnosis codes like C51.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Adenocarcinoma of anogenital mammary-like glands
  • Adnexal carcinoma of vulva
  • Anogenital verrucous carcinoma of Buschke-Löwenstein
  • Basal cell carcinoma of vulva
  • Carcinoma of vulva
  • Carcinoma of vulva
  • Carcinoma of vulva
  • FIGO stage finding for vulvar melanoma
  • FIGO VM stage V
  • Infective dermatosis of female genitalia
  • Invasive vulval Paget's disease
  • Malignant melanoma of perineum
  • Malignant melanoma of perineum
  • Malignant melanoma of skin of perineum
  • Malignant melanoma of skin of vulva
  • Malignant melanoma of vulva
  • Malignant tumor of vulva
  • Paget's disease of vulva
  • Primary adenocarcinoma of vulva
  • Primary adnexal carcinoma of vulva
  • Primary extramammary Paget disease of skin
  • Primary extramammary Paget disease of skin
  • Primary invasive vulval Paget disease
  • Primary malignant neoplasm of vulva
  • Primary Paget disease of vulva
  • Recurrent primary malignant neoplasm of vulva
  • Sarcoma of vulva
  • Sarcoma of vulva
  • Squamous cell carcinoma of anogenital area
  • Squamous cell carcinoma of anogenital area
  • Squamous cell carcinoma of anogenital area
  • Squamous cell carcinoma of anogenital area
  • Squamous cell carcinoma of skin of trunk
  • Squamous cell carcinoma of vulva
  • Squamous cell carcinoma of vulva
  • Squamous cell carcinoma of vulva
  • Squamous cell carcinoma of vulva due to lichen sclerosus
  • Vulval verrucous carcinoma of Buschke-Löwenstein
  • Vulvovaginal rhabdomyosarcoma

Clinical Classification

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Malignant neoplasm of external female genitalia NOS
  • Malignant neoplasm of pudendum

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10-CM Code Edits are applicable to this code:

  • Diagnoses for females only - The Medicare Code Editor detects inconsistencies between a patient’s sex and any diagnosis on the patient’s record, these edits apply to FEMALES only .

Convert C51.9 to ICD-9-CM

  • ICD-9-CM Code: 184.4 - Malign neopl vulva NOS

Table of Neoplasms

This code is referenced in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

Neoplasm, neoplastic Malignant
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»Neoplasm, neoplastic
  »fourchette
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »labia (skin)
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »labium (skin)
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »mons
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »mons
    »pubis
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »mons
    »veneris
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »pudenda, pudendum (femaie)
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »skin NOS
    »female genital organs (external)
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »skin NOS
    »female genital organs (external)
      »labium NEC
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »skin NOS
    »female genital organs (external)
      »pudendum
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »skin NOS
    »female genital organs (external)
      »vulva
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »skin NOS
    »vulva
C51.9C79.82D07.1D28.0D39.8D49.59
»Neoplasm, neoplastic
  »vulva
C51.9C79.82D07.1D28.0D39.8D49.59

Patient Education


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.

Often, vulvar cancer doesn't cause symptoms at first. However, see your doctor for testing if you notice:

  • A lump in the vulva
  • Vulvar itching or tenderness
  • Bleeding that is not your period
  • Changes in the vulvar skin, such as color changes or growths that look like a wart or ulcer

You are at greater risk if you've had a human papillomavirus (HPV) infection or have a history of genital warts. Your health care provider diagnoses vulvar cancer with a physical exam and a biopsy. Treatment varies, depending on your overall health and how advanced the cancer is. It might include surgery, radiation therapy, chemotherapy, or biologic therapy. Biologic therapy boosts your body's own ability to fight cancer.

NIH: National Cancer Institute


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

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.