2021 ICD-10-CM Diagnosis Code C51.9

Malignant neoplasm of vulva, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • C51.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM C51.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of C51.9 - other international versions of ICD-10 C51.9 may differ.
Applicable To
  • Malignant neoplasm of external female genitalia NOS
  • Malignant neoplasm of pudendum
The following code(s) above C51.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C51.9:
  • C00-D49
    2021 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • 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).
    Neoplasms
  • C51-C58
    2021 ICD-10-CM Range C51-C58

    Malignant neoplasms of female genital organs

    Includes
    • malignant neoplasm of skin of female genital organs
    Malignant neoplasms of female genital organs
  • C51
    ICD-10-CM Diagnosis Code C51

    Malignant neoplasm of vulva

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • carcinoma in situ of vulva (D07.1)
    Malignant neoplasm of vulva
Approximate Synonyms
  • Basal cell carcinoma of vulva
  • Basal cell carcinoma, vulva
  • Cancer of the vulva
  • Cancer of the vulva, adenocarcinoma
  • Cancer of the vulva, disseminated
  • Cancer of the vulva, pagets disease
  • Cancer of the vulva, pagets disease, invasive
  • Cancer of the vulva, recurrent to primary site
  • Cancer of the vulva, squamous cell
  • Cancer of vulva, disseminated
  • Invasive vulval paget's disease
  • Malignant melanoma of vulva
  • Melanoma, vulva
  • Paget's disease of vulva
  • Primary adenocarcinoma of vulva
  • Primary malignant neoplasm of vulva
  • Recurrent primary malignant neoplasm of vulva
  • Squamous cell carcinoma of vulva
Clinical Information
  • Primary or metastatic malignant neoplasm involving the vulva.
  • Vulvar cancer is a rare type of cancer. It forms in a woman's external genitals, called the vulva. The cancer usually develops 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 early symptoms. However, see your doctor for testing if you notice
    • a lump in the vulva
    • vulvar itching or tenderness
    • bleeding that is not your period
    being older and having a human papillomavirus infection are risk factors for vulvar cancer. Treatment varies, depending on your overall health and how advanced the cancer is. It might include laser therapy, surgery, radiation or chemotherapy. nih: national cancer institute
ICD-10-CM C51.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 736 Uterine and adnexa procedures for ovarian or adnexal malignancy with mcc
  • 737 Uterine and adnexa procedures for ovarian or adnexal malignancy with cc
  • 738 Uterine and adnexa procedures for ovarian or adnexal malignancy without cc/mcc
  • 739 Uterine and adnexa procedures for non-ovarian and non-adnexal malignancy with mcc
  • 740 Uterine and adnexa procedures for non-ovarian and non-adnexal malignancy with cc
  • 741 Uterine and adnexa procedures for non-ovarian and non-adnexal malignancy without cc/mcc
  • 754 Malignancy, female reproductive system with mcc
  • 755 Malignancy, female reproductive system with cc
  • 756 Malignancy, female reproductive system without cc/mcc

Convert C51.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to C51.9:
  • Melanoma (malignant) C43.9
    ICD-10-CM Diagnosis Code C43.9

    Malignant melanoma of skin, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Malignant melanoma of unspecified site of skin
    • Melanoma (malignant) NOS
    • skin C43.9
      ICD-10-CM Diagnosis Code C43.9

      Malignant melanoma of skin, unspecified

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      Applicable To
      • Malignant melanoma of unspecified site of skin
      • Melanoma (malignant) NOS
      • labium C51.9
      • vulva C51.9
      • female genital organ C51.9 (external)
      • pudendum C51.9

ICD-10-CM Codes Adjacent To C51.9
C50.919 Malignant neoplasm of unspecified site of unspecified female breast
C50.92 Malignant neoplasm of breast of unspecified site, male
C50.921 Malignant neoplasm of unspecified site of right male breast
C50.922 Malignant neoplasm of unspecified site of left male breast
C50.929 Malignant neoplasm of unspecified site of unspecified male breast
C51 Malignant neoplasm of vulva
C51.0 Malignant neoplasm of labium majus
C51.1 Malignant neoplasm of labium minus
C51.2 Malignant neoplasm of clitoris
C51.8 Malignant neoplasm of overlapping sites of vulva
C51.9 Malignant neoplasm of vulva, unspecified
C52 Malignant neoplasm of vagina
C53 Malignant neoplasm of cervix uteri
C53.0 Malignant neoplasm of endocervix
C53.1 Malignant neoplasm of exocervix
C53.8 Malignant neoplasm of overlapping sites of cervix uteri
C53.9 Malignant neoplasm of cervix uteri, unspecified
C54 Malignant neoplasm of corpus uteri
C54.0 Malignant neoplasm of isthmus uteri
C54.1 Malignant neoplasm of endometrium
C54.2 Malignant neoplasm of myometrium

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.