A healthcare professional reviewing ICD-10 codes for amenorrhea, ensuring accurate medical documentation.

Amenorrhea ICD-10 Code: Diagnosis, Causes, and Management

Medical terminology for the lack of menstruation refers to amenorrhea, which is divided into two main categories: primary amenorrhea, which occurs in women who have not begun menstruating by the age of sixteen, and secondary amenorrhea, which happens to women who have previously experienced menstruation and have not had a period for at least three consecutive menstrual cycles. Amenorrhea may be diagnosed using certain codes from the International Classification of Diseases, 10th Edition (ICD-10).

The ICD-10 code for primary amenorrhea is N91.0, while the code for secondary amenorrhea is N91.1. These codes are used by healthcare professionals to accurately record and classify diagnoses in medical records and insurance claims.

Understanding Amenorrhea ICD-10 Code

The ICD-10 code for amenorrhea, which is categorized under Chapter XV, is precisely in the range N91. This code includes a number of subcategories that enable a thorough and accurate categorization of the ailment according to its fundamental causes. For medical professionals, accurate coding is essential because it facilitates efficient insurance claims processing, statistical analysis, and medical recordkeeping.

Key Subcategories of Amenorrhea ICD-10 Code

N91.0 – Primary Amenorrhea

Primary amenorrhea refers to the absence of menstruation in a female by the age of 16, without the development of secondary sexual characteristics, or by the age of 14 with the presence of secondary sexual characteristics. Accurate documentation under N91.0 is essential to distinguish it from secondary amenorrhea and guide appropriate clinical interventions.

N91.1 – Secondary Amenorrhea

Secondary amenorrhea pertains to the sudden cessation of menstrual periods in a woman who has previously experienced regular menstruation. This code is vital for indicating a change in menstrual patterns and helps healthcare providers identify potential underlying causes, such as hormonal imbalances or reproductive system disorders.

N91.2 – Amenorrhea Due to Pregnancy

When a woman experiences amenorrhea due to pregnancy, proper coding under N91.2 ensures accurate representation of the pregnancy-related absence of menstruation. This distinction is crucial for obstetric care, facilitating optimal maternal and fetal health management.

N91.3 – Amenorrhea Due to lactation

Lactation-induced amenorrhea, coded under N91.3, highlights the natural suppression of menstruation during breastfeeding. Accurate coding aids in recognizing this physiological phenomenon and supports comprehensive postpartum care.

N91.8 – Other Specified Amenorrhea

For cases that do not precisely fit into the aforementioned categories, N91.8 provides a code for other specified amenorrhea. This catch-all category allows flexibility in coding, accommodating unique clinical scenarios that may not align with standard classifications.

N91.9 – Amenorrhea, Unspecified

When the specific cause of amenorrhea cannot be determined or is not documented, N91.9 serves as the code for unspecified amenorrhea. While this code provides a broad classification, healthcare professionals should strive for precise documentation whenever possible.

Importance of Accurate Amenorrhea ICD-10 Coding

Precise and comprehensive ICD-10 coding for amenorrhea is essential for many reasons. First off, by helping medical professionals find and treat the underlying causes of amenorrhea, it guarantees appropriate patient treatment. Furthermore, proper coding makes it easier to handle insurance claims quickly and efficiently, which lessens the administrative strain on medical facilities. Finally, thorough coding helps to produce reliable statistical data that helps scholars and decision-makers understand the frequency and patterns of amenorrhea.

Causes of Amenorrhea

  1. Pregnancy: One of the most common causes of secondary amenorrhea is pregnancy. It is important to rule out pregnancy in any woman of reproductive age who presents with amenorrhea.
  2. Polycystic Ovary Syndrome (PCOS): This hormonal disorder is characterized by the presence of small cysts on the ovaries and can lead to irregular or absent periods.
  3. Hypothalamic Amenorrhea: This condition is often related to stress, excessive exercise, or low body weight, leading to a disruption in the normal functioning of the hypothalamus.
  4. Premature Ovarian Failure (POF): Also known as early menopause, POF occurs when the ovaries stop functioning before the age of 40, resulting in amenorrhea.
  5. Thyroid Disorders: Imbalances in thyroid hormones can affect menstrual cycles, leading to amenorrhea.

Management of Amenorrhea

The management of amenorrhea depends on its underlying cause. It may include:

  1. Lifestyle Changes: Addressing factors such as stress, excessive exercise, or weight issues may be crucial in certain cases.
  2. Hormonal Therapy: In cases of hormonal imbalances, hormonal therapy may be prescribed to regulate menstrual cycles.
  3. Treatment of Underlying Conditions: Managing conditions such as PCOS, thyroid disorders, or pituitary disorders is essential for restoring normal menstrual function.
  4. Fertility Treatment: For women trying to conceive, fertility treatments may be considered after identifying and addressing the specific cause of amenorrhea.

Diagnostic Evaluation

When a woman presents with amenorrhea, a thorough diagnostic evaluation is essential to determine the underlying cause. This may involve:

  1. Medical History: Gathering information about the individual’s menstrual history, any recent life changes, medications, and symptoms is crucial.
  2. Physical Examination: A comprehensive physical examination may help identify signs of hormonal imbalances, structural abnormalities, or other potential causes.
  3. Laboratory Tests: Blood tests to assess hormone levels, including those of thyroid hormones, prolactin, and reproductive hormones (such as FSH and LH), can provide valuable diagnostic information.
  4. Imaging Studies: Pelvic ultrasound or other imaging studies may be performed to evaluate the reproductive organs for any structural abnormalities.
  5. Pregnancy Test: A pregnancy test is often one of the first diagnostic steps to rule out pregnancy as a cause of amenorrhea.
  6. Endometrial Biopsy: In some cases, a biopsy of the uterine lining may be performed to assess for conditions like Asherman’s syndrome.


Amenorrhea is a symptom that has to be carefully examined in order to determine the underlying reason and treat it. To diagnose and treat patients in a complete and efficient manner, healthcare specialists from different specialties—such as genecology, endocrinology, and reproductive medicine—must collaborate. People who have amenorrhea should consult a doctor as soon as possible for a proper diagnosis and course of therapy.

Aahana Khan is a versatile content writer who skillfully combines her expertise in biotechnology with creative communication. Her strong educational background in biotechnology provides a scientific lens to her writing, making complicated ideas easy to understand for a wide range of readers. Driven by her passion for effective communication, she seamlessly transitioned from her biotechnology roots to a thriving career in content writing.

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