N77.0Ulceration of vulva in diseases classified elsewhere

N77.0 is the ICD-10-CM diagnosis code for ulceration of vulva in diseases classified elsewhere. It belongs to category N77 (Vulvovaginal ulceration and inflammation in diseases classified elsewhere), block N70-N77 (inflammatory diseases of female pelvic organs) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N77 (Vulvovaginal ulceration and inflammation in diseases classified elsewhere), N77.0 is specifically for ulceration of vulva in diseases classified elsewhere. Related codes cover vaginitis, vulvitis and vulvovaginitis in diseases classified elsewhere (N77.1).

Don't report N77.0 together with the conditions in its Excludes1 note: ulceration of vulva in gonococcal infection (A54.02), ulceration of vulva in herpesviral [herpes simplex] infection (A60.04), ulceration of vulva in syphilis (A51.0) and ulceration of vulva in tuberculosis (A18.18).

Code first underlying disease, such as: Behçet's disease (M35.2).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC, relative weight 1.0129) and DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC, relative weight 0.7041), in MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

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

Before ICD-10, this condition was coded in ICD-9-CM as 616.51 (ulceration of vulva in diseases classified elsewhere).