ICD-10-CM 2027 diagnosis code

C51Malignant neoplasm of vulva

Not billable — use a more specific code

C51 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C51

C51 is the ICD-10-CM diagnosis code for malignant neoplasm of vulva. It belongs to block C51-C58 (malignant neoplasms of female genital organs) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C51.0 (majus), C51.1 (minus), C51.2 (clitoris), C51.8 (vulva) and C51.9 (unspecified).

Don't report C51 together with the conditions in its Excludes1 note: carcinoma in situ of vulva (D07.1).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C51

Coding notes

Excludes1Not coded here — never report together with this code

carcinoma in situ of vulva (D07.1)

Notes that apply from higher levels

Instructions written at a parent level also apply to C51.

Broader instructions also apply from C51-C58 Malignant neoplasms of female genital organs and Chapter 2: Neoplasms.

Codes whose notes reference C51

C43Excludes2
C44Excludes1

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about C51

Is C51 billable?: No. C51 is a header code. Report one of its more specific subcodes instead.