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N92.5 - Irregular Menstruation | ICD-10 Code
N92.5 is an ICD-10 code for other specified irregular menstruation. It describes menstrual cycle irregularities that do not fit more specific diagnostic categories.
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N92.5 is an ICD-10 code for other specified irregular menstruation. It describes menstrual cycle irregularities that do not fit more specific diagnostic categories.
What Does the ICD-10 Code N92.5 Mean?
The ICD-10 code N92.5 stands for other specified irregular menstruation. It is used when a woman experiences menstrual cycle irregularities that cannot be clearly classified under more specific diagnoses such as polymenorrhoea (N92.0), oligomenorrhoea (N91), or amenorrhoea. The code belongs to the ICD-10 group N92, which covers various forms of irregular, excessive, or too frequent menstruation.
Causes
Irregular menstruation coded under N92.5 can have many underlying causes:
- Hormonal imbalances: Disruptions in the oestrogen-progesterone balance, e.g. due to thyroid disorders or elevated prolactin levels.
- Polycystic ovary syndrome (PCOS): A common cause of irregular cycles.
- Stress-related dysregulation: Physical or psychological stress can disrupt the hypothalamic-pituitary-ovarian axis.
- Significant underweight or overweight: Changes in body fat percentage directly affect hormone metabolism.
- Perimenopause: During the transitional phase before menopause, cycles can become unpredictable.
- Medications: Including anticoagulants, antipsychotics, or hormonal contraceptives.
- Uterine causes: Fibroids, polyps, or endometriosis can alter bleeding patterns.
Symptoms
Depending on the underlying cause, the following symptoms may occur:
- Irregular intervals between menstrual bleeds
- Fluctuating bleeding intensity (sometimes heavier, sometimes lighter)
- Intermenstrual bleeding outside the expected cycle
- Intensified premenstrual syndrome (PMS)
- Lower abdominal pain or cramps
Diagnosis
The diagnosis N92.5 is made after other specific causes have been excluded. Typical diagnostic steps include:
- Medical history and cycle diary: Documentation of the bleeding pattern over several months.
- Laboratory tests: Measurement of hormones such as FSH, LH, oestradiol, progesterone, TSH, and prolactin.
- Ultrasound examination (sonography): Assessment of the uterus and ovaries.
- Gynaecological examination: Exclusion of structural abnormalities.
- Further investigations if needed: Hysteroscopy or endometrial biopsy if organic causes are suspected.
Treatment
Treatment depends on the underlying cause:
- Hormonal therapy: Progestogens, combined oral contraceptives, or hormone replacement therapy can help regulate the cycle.
- Treatment of the underlying condition: E.g. thyroid medication for hypothyroidism or metformin for PCOS.
- Lifestyle adjustments: Stress reduction, normalisation of body weight, and regular physical activity.
- Surgical procedures: For fibroids, polyps, or endometriosis, surgical intervention may be necessary.
- Watchful waiting: In mild cases, such as perimenopausal dysregulation, careful monitoring may be sufficient.
When to See a Doctor?
Women should seek medical advice if:
- the cycle remains irregular for several months,
- bleeding is very heavy or unusual pain occurs,
- intermenstrual bleeding occurs after menopause,
- there is a desire for pregnancy and the cycle is irregular.
References
- World Health Organization (WHO): International Classification of Diseases, 10th Revision (ICD-10). Geneva, 2019.
- Berek, J.S. (ed.): Berek and Novak's Gynecology. 16th edition. Wolters Kluwer, 2020.
- National Institute for Health and Care Excellence (NICE): Heavy menstrual bleeding: assessment and management. NICE guideline NG88, 2021.
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