2026 ICD-10-CM Diagnosis Code N77.0Ulceration of vulva in diseases classified elsewhere
ICD-10-CM Codes›N00–N99›N70-N77›N77
- Billable — Valid for Submission
- Not Chronic
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 2026 (October 1, 2025 through September 30, 2026) 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 associated with another disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for N77.0.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Ulceration of vulva associated with another disorder
- Ulceration of vulva in Behcet's disease
- Vulvitis associated with another disorder
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- underlying disease, such as:
- Behçet's disease M35.2
Type 1 Excludes
- 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
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Vulvar Disorders
The vulva is the external part of a woman's genitals. Some problems you can have with the vulvar area include:
Read the full article at MedlinePlus
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Convert N77.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N77.0Overview
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, 2025 through September 30, 2026.
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 0.5696 to 1.8348 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.
What is the ICD-9 equivalent of N77.0?
Under the General Equivalence Mappings, ulceration of vulva in diseases classified elsewhere converts to ICD-9-CM 616.51 (vulvar ulcer in oth dis). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
