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N91.0

N91.0: Primary amenorrhea

Billable / specific codeICD-10-CM

N91.0 is a billable, specific ICD-10-CM code for primary amenorrhea. It is valid for submission on a claim.

Check N91.0 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above N91.0

A category’s note binds every code beneath it.

Written on N91: Absent, scanty and rare menstruation

  • ovarian dysfunction (E28.-)

Risk adjustment

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

Medicare coverage

N91.0 is named in 1 Medicare coverage policy: 1 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Alphabetic index entries that lead here

  • Amenorrhea›primary
  • Delay, delayed›menstruation(cause unknown)
  • Failure, failed›menstruation at puberty
  • Menstruation›delayed

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.