ICD-10 · PDGM grouping
N77 Vulvovaginal ulceration and inflammation in diseases classified elsewhere
All 2 codes in the N77 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
2
Can lead a claim
0
Cannot lead a claim
2
What CMS assigns to N77
None of the 2 codes is assigned a clinical group. None of the 2 is assigned a comorbidity subgroup. None can lead a claim. CMS attaches a code-first note to all 2.
Code first
CMS grouper convention 143, on N77.0. Code first:
- Behçet's disease (M35.2)
- underlying disease, such as:
CMS grouper convention 144, on N77.1. Code first:
- pinworm (B80)
- underlying disease, such as:
Every code in N77
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| N77.0 | Ulceration of vulva in diseases classified elsewhere | Cannot lead a claimManifestation code is not reportable as principal diagnosis | None | None |
| N77.1 | Vaginitis, vulvitis and vulvovaginitis in diseases classified elsewhereCMS: Vaginitis, vulvitis and vulvovaginitis in dis classd elswhr | Cannot lead a claimManifestation code is not reportable as principal diagnosis | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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