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 | ✓ |
| N91.0 | Primary amenorrhea | ✓ |
| N91.1 | Secondary amenorrhea | ✓ |
| N91.1 | Secondary amenorrhea | ✓ |
| N91.2 | Amenorrhea, unspecified | ✓ |
| N91.2 | Amenorrhea, unspecified | ✓ |
| N91.3 | Primary oligomenorrhea | ✓ |
| N91.3 | Primary oligomenorrhea | ✓ |
| N91.4 | Secondary oligomenorrhea | ✓ |
| N91.4 | Secondary oligomenorrhea | ✓ |
| N91.5 | Oligomenorrhea, unspecified | ✓ |
| N91.5 | Oligomenorrhea, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code N91?
N91 is an ICD-10-CM category covering Absent, scanty and rare menstruation. It contains 12 more specific diagnosis codes, 12 of which are billable.
Is N91 a billable code?
No — N91 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example N91.0 — Primary amenorrhea). 12 of the 12 codes under N91 are billable.
What codes fall under N91?
N91 includes N91.0, N91.0, N91.1, N91.1, N91.2, plus 7 more. See the full list with descriptions and billable status above.
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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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