N90.0 — Mild vulvar dysplasia
N90.0 is a billable, specific ICD-10-CM code for mild vulvar dysplasia. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Vulvar intraepithelial neoplasia [VIN], grade I
Excludes1 inherited from the categories above N90.0
These are not written on N90.0, but they bind it: a note on a category applies to every code beneath it. Billing N90.0 with anything listed here is a denial.
Written on N90 — Other noninflammatory disorders of vulva and perineum
Other codes that can never be billed with N90.0
These codes carry an Excludes1 note pointing at N90.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N90.0 alone.
- R87.69Abnormal cytological findings in specimens from other female genital organs
Risk adjustment
N90.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N90.0 is named in 5 Medicare coverage policies — 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56346Billing and Coding: Removal of Benign and Malignant Skin Lesions
- A57044Billing and Coding: Removal of Benign Skin Lesions
- A57113Billing and Coding: Removal of Benign Skin Lesions
- A57113Billing and Coding: Removal of Benign Skin Lesions
How N90.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N90.0.
- Dysplasia›vulva›mild
- Neoplasia›intraepithelial›vulva›grade I
Code history
N90.0 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share N90. If N90.0 is not quite right, the correct code is usually one of these.
Questions about N90.0
- Is N90.0 a billable ICD-10-CM code?
- Yes. N90.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N90.0 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Noninflammatory disorders of female genital tract (N80-N98).
- What cannot be coded together with N90.0?
- N90.0 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above N90.0 (N90) and apply to it just the same.