N91
Non-billableAbsent, scanty and rare menstruation
N91 is the ICD-10-CM code for Absent, scanty and rare menstruation. It is a non-billable category code — use a more specific child code such as N91.0 for billing.
- Status
- Header (non-billable)
- Chapter
- N00-N99
- Subcodes
- 6
- Edition
- FY2026
N00-N99 Diseases of the genitourinary system
What this means — in plain language
MedlinePlus · NIHWhat is menstruation? Menstruation, also called a period, is normal vaginal bleeding that happens as part of the monthly cycle in women and girls. Every month, the body prepares for pregnancy. If pregnancy does not happen, the uterus (womb) sheds its lining. This blood and tissue leave the body through the vagina. What is the menstrual cycle? The menstrual cycle is the monthly process the body goes through to…
Read more about Menstruation at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
- •ovarian dysfunction (E28.-)
Medications indicated for this condition
FDA labelingDrugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code N91?
- N91 is the ICD-10-CM code for "Absent, scanty and rare menstruation". It falls under N00-N99 Diseases of the genitourinary system.
- Is N91 a billable code?
- No — N91 is a non-billable header code. Use a more specific child code (such as N91.0) for billing.
- What is excluded from N91?
- Excludes1 (not coded here): ovarian dysfunction (E28.-).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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