MCMedicalCodingSoftware
N91.5

N91.5: Oligomenorrhea, unspecified

Billable / specific codeICD-10-CM

N91.5 is a billable, specific ICD-10-CM code for oligomenorrhea, unspecified. It is valid for submission on a claim.

Check N91.5 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Hypomenorrhea NOS

Excludes1 inherited from the categories above N91.5

A category’s note binds every code beneath it.

Written on N91: Absent, scanty and rare menstruation

  • ovarian dysfunction (E28.-)

Other codes that can never be billed with N91.5

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • N92.6Irregular menstruation, unspecified

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Oligomenorrhea

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under N91

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.