2027 ICD-10-CM Diagnosis Code N77.0Ulceration of vulva in diseases classified elsewhere

ICD-10-CM Codes›N00–N99›N70-N77›N77

ICD-10-CM N77.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N77.0 is a billable ICD-10-CM diagnosis code for ulceration of vulva in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 742 through 743, 760 through 761. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as ulceration of vulva in Behcet's disease. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N77.0
Billable Status
Yes — Valid for Submission
Code Describes
Ulceration of vulva in diseases classified elsewhere
Short Description
Ulceration of vulva in diseases classified elsewhere
Same as the full description in the CMS dataset.
Parent Code
N77
Vulvovaginal ulceration and inflammation in diseases classified elsewhere

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN70-N77Inflammatory diseases of female pelvic organs
CategoryN77Vulvovaginal ulceration and inflammation in diseases classified elsewhere
This CodeN77.0Ulceration of vulva in diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for N77.0.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ulceration of vulva in Behcet's disease
  • Vulvitis associated with another disorder

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N77.0: its own notes plus those printed at block N70-N77 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On N77.0 itself
  • 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)
  • ulceration of vulva in tuberculosis (A18.18)
From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • inflammatory diseases of female pelvic organs complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.0)
  • pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

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

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • if applicable, pelvic abscess (K6A.0-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN018
Inflammatory diseases of female pelvic organs
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Vulvar Disorders

The vulva is the outer part of the female genitals. This includes the clitoris, vaginal lips, and the opening to the vagina. A vulvar disorder is a health problem that affects your vulva. These problems may cause pain, itching, or skin changes of the vulva. Treatment depends on the cause.

The full article covers:

  • What are vulvar disorders?
  • Who is more likely to develop vulvar disorders?
  • What are the symptoms of vulvar disorders?
  • How are vulvar disorders diagnosed?
  • What are the treatments for vulvar disorders?
  • Can vulvar disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N77.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
616.51 Vulvar ulcer in oth dis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N77.0Overview

What is the ICD-10 code for ulceration of vulva in diseases classified elsewhere?

The ICD-10-CM code for ulceration of vulva in diseases classified elsewhere is N77.0 (sometimes written as N770). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N77.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report ulceration of vulva in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N77.0 group to?

On inpatient claims, ulceration of vulva in diseases classified elsewhere maps to MS-DRG 742, 743, 760, 761, with relative weights from 0.7039 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.

Can N77.0 be a principal diagnosis?

No. This is a manifestation code: ulceration of vulva in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.

Can N77.0 be reported with A54.02?

Not as a rule. The Excludes1 note on N77.0 lists "ulceration of vulva in gonococcal infection (A54.02)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).