N91: Absent, scanty and rare menstruation

Codes under N91 (Absent, scanty and rare menstruation). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
N91.0	Primary amenorrhea	✓
N91.1	Secondary amenorrhea	✓
N91.2	Amenorrhea, unspecified	✓
N91.3	Primary oligomenorrhea	✓
N91.4	Secondary oligomenorrhea	✓
N91.5	Oligomenorrhea, unspecified	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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