N91.4 is the ICD-10 code for Secondary oligomenorrhoea. It is a four-character subcategory of N91 (Absent, scanty and rare menstruation), the most specific level in the WHO edition. It belongs to the block N80–N98 (Noninflammatory disorders of female genital tract) in Chapter XIV, Diseases of the genitourinary system.
- Code type
- Subcategory (4 characters)
- Chapter
- XIV · N00–N99
- Classification
- WHO ICD-10, 2019 version
Coding notes
- Scanty and rare menstruation in a woman with previously normal periods.
N91.4 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
N91.4Sekundær oligomenoré
DN914Sekundær oligomenoré
- DN914ASekundær hypomenoré
- DN914CSekundær oligohypomenoré
N91.4Sekundaarinen oligomenorrea
N91.4Sekundäre Oligomenorrhoe
N91.4Oligoménorrhée secondaire
N91.4secundaire oligomenorroe
N91.4Secondary oligomenorrhea
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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