N89.1 ICD-10-CM Code: Moderate vaginal dysplasia
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Noninflammatory disorders of female genital tract (N80-N98)
N89.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceModerate vaginal dysplasia
Moderate-stage abnormal cell changes in the vagina that show more significant abnormality than mild dysplasia but are not yet cancerous.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Vaginal intraepithelial neoplasia [VAIN], grade II
Excludes 2
Official- senile (atrophic) vaginitis (N95.2)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N89.1 in this effective period.
Excludes 1
Official- abnormal results from vaginal cytologic examination without histologic confirmation (R87.62-)
- carcinoma in situ of vagina (D07.2)
- HGSIL of vagina (R87.623)
- inflammation of vagina (N76.-)
- severe dysplasia of vagina (D07.2)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for N89.1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for N89.1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for N89.1 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is N89.1 an HCC code?
No. N89.1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- N89.1
- Description
- Moderate vaginal dysplasia
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
N89.1 is the ICD-10-CM diagnosis code for moderate vaginal dysplasia. Moderate-stage abnormal cell changes in the vagina that show more significant abnormality than mild dysplasia but are not yet cancerous. N89.1 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering noninflammatory disorders of female genital tract (n80-n98).
N89.1 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Moderate dysplasia typically corresponds to VIN 2 or CIN 2; distinguish from mild and severe dysplasia.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N89.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Moderate dysplasia typically corresponds to VIN 2 or CIN 2; distinguish from mild and severe dysplasia
- •Document biopsy results and any recommended follow-up or treatment such as laser therapy or excision