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 2026, 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.
About the N91 Code Range
The ICD-10 codes N91 cover conditions involving absent, scanty, or infrequent menstruation. These codes specifically identify types of amenorrhea and oligomenorrhea, helping healthcare providers classify menstrual disorders accurately.
The ICD-10 code for absent menstruation includes N91.0 for primary amenorrhea, which refers to delayed or absent first menstrual periods, also known as physiologic or primary physiologic amenorrhea. N91.1 represents secondary amenorrhea, describing the loss of menstruation after it has previously occurred; this may be linked to several causes such as pituitary dysfunction, exercise-related amenorrhea, or lactational amenorrhea. When the cause is unclear, N91.2 is used for unspecified amenorrhea. Infrequent or scanty menstruation is classified under N91.3 and N91.4 for primary and secondary oligomenorrhea respectively, with N91.5 addressing unspecified cases. These codes aid medical coders and clinicians in accurately documenting menstrual irregularities, ensuring proper diagnosis and treatment planning.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
