Secondary oligomenorrhea

This code represents a condition where a woman, who previously had regular menstrual cycles, experiences infrequent or light menstruation due to an underlying medical cause. It signifies a disruption in the normal menstrual pattern that is not primary in nature.

Use this code when documentation indicates a patient presents with oligomenorrhea that has developed after a period of normal menstrual function and is attributed to another medical condition, medication, or lifestyle factor. This code is appropriate when the infrequent periods are a symptom of an identifiable secondary cause.

• Always code the underlying cause of the secondary oligomenorrhea first, if known and documented.
• Distinguish from primary oligomenorrhea (N91.3), which refers to infrequent periods from menarche.
• Ensure documentation clearly states the oligomenorrhea is "secondary" or implies a previously normal menstrual pattern.