Malignant neoplasm of vulva
In Malignant neoplasms of female genital organs (C51-C58), chapter 2: Neoplasms
5 billable codes under C51: none are a CC or MCC; all map to HCC 22 (Bladder, Colorectal, and Other Cancers).An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes1: not coded here, use a different code
- carcinoma in situ of vulva (D07.1)
Also applies, from Malignant neoplasms of female genital organs (C51-C58)
These notes sit on C51-C58 and apply to every code under it, including C51.
Includes: conditions that are coded here
- malignant neoplasm of skin of female genital organs
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding benign and malignant neoplasms: using the Neoplasm Table, sequencing primary and secondary sites, treatment encounters, complications, and current cancer versus personal history.
- Admission/Encounter for treatment of primary site (page 33)
- Admission/Encounter for treatment of secondary site (page 33)
- Coding and sequencing of complications (page 34)
- Primary malignancy previously excised (page 34)
- Admissions/Encounters involving antineoplastic chemotherapy, immunotherapy and radiation therapy (page 35)
- Admission/encounter to determine extent of malignancy (page 36)
- Symptoms, signs, and abnormal findings listed in Chapter 18 associated with neoplasms (page 36)
- Admission/encounter for pain control/management (page 36)
All codes under C51
C51 can't be used on a claim. Pick a billable code below; grey headings group them.
C51 MS-DRGs
As the principal diagnosis, all 5 billable codes under C51 group to MS-DRG 731, 732, 733, 754, 755, or 756 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 731 Uterine and Adnexa Procedures for Malignancy with MCC
- DRG 732 Uterine and Adnexa Procedures for Malignancy with CC
- DRG 733 Uterine and Adnexa Procedures for Malignancy without CC/MCC
- DRG 754 Malignancy, Female Reproductive System with MCC
- DRG 755 Malignancy, Female Reproductive System with CC
- DRG 756 Malignancy, Female Reproductive System without CC/MCC
Other codes that refer to C51
Notes on these codes point to C51.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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 more about vulvar cancer on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.