Is N90 a billable ICD-10-CM code?

No. N90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N90 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?

N90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

N90

N90 — Other noninflammatory disorders of vulva and perineum

Non-billable headerICD-10-CM

N90 is a non-billable header ICD-10-CM code for other noninflammatory disorders of vulva and perineum. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

anogenital (venereal) warts (A63.0)
carcinoma in situ of vulva (D07.1)
condyloma acuminatum (A63.0)
current obstetric trauma (O70.-, O71.7-O71.8)
inflammation of vulva (N76.-)
severe dysplasia of vulva (D07.1)
vulvar intraepithelial neoplasm III [VIN III] (D07.1)

Other codes that can never be billed with N90

These codes carry an Excludes1 note pointing at N90. 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 alone.

R87.69Abnormal cytological findings in specimens from other female genital organs
D07.1Carcinoma in situ of vulva

Risk adjustment

N90 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.

Code to one of these instead N90

9 child codes. Green means billable.

Questions about N90

Is N90 a billable ICD-10-CM code?: No. N90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N90 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?: N90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.