Absent, scanty and rare menstruation (N91) ICD-10-CM
The N91 code range covers absent, scanty and rare menstruation with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- ovarian dysfunction E28
Codes in the N91 Range 7 codes · 6 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the N91 range.
Amenorrhea
Absence of menstruation.
Oligomenorrhea
Abnormally infrequent menstruation.
Primary Amenorrhea
Abnormally late or absent menarche in a female with normal secondary sexual characteristics.
Secondary Amenorrhea
The cessation of menstruation for six months or more in a female that is not pregnant, breastfeeding or menopausal.
About the N91 Code Range
Menstrual periods may be absent, scanty, or infrequent. The subdivisions distinguish amenorrhea, meaning absent periods, from oligomenorrhea, meaning infrequent periods.
For amenorrhea, N91.0 is primary, N91.1 is secondary, and N91.2 is unspecified. For oligomenorrhea, N91.3 is primary, N91.4 is secondary, and N91.5 is unspecified.
Questions About This Page
How many billable codes are in the N91 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the N91 range classify?
The range classifies absent, scanty and rare menstruation. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
