N80-N98: Noninflammatory disorders of female genital tract

N91: Absent, scanty and rare menstruation

Absent, scanty, and rare menstruation is a group of menstrual disorders where a woman's menstrual cycle is irregular or absent. This condition also includes a condition called amenorrhea where menstruation stops for several months or longer. Another example within this group, oligomenorrhea, refers to periods that occur infrequently or at irregular intervals. These conditions can be due to a range of causes, like hormonal imbalances, disorders of the reproductive system, extreme weight loss, stress, or certain medications. Women with these disorders might experience menstrual cycles that are either absent for several months, very light, less frequent than normal, or a combination of these. In terms of disease progression, these disorders don't usually progress into more severe conditions, but can potentially impact fertility and could be a sign of other underlying health issues. It is critical to consult with a healthcare provider for an accurate diagnosis and management of these conditions.