E34.5 Androgen insensitivity syndrome

Name of the Condition

• Androgen Insensitivity Syndrome (ICD-10 Code: E34.5)

Summary

Androgen insensitivity syndrome (AIS) is a genetic condition where individuals with XY chromosomes are resistant to male hormones (androgens), leading to impaired development of male characteristics. This results in varying degrees of undermasculinization, depending on the extent of androgen receptor dysfunction. The condition affects sexual development and may present with ambiguous genitalia, primary amenorrhea, or infertility, requiring clinical and genetic evaluation for diagnosis.

Causes

AIS is caused by mutations in the androgen receptor gene, which disrupts the body’s ability to respond to androgens. These mutations can be inherited or occur spontaneously. The severity of the condition depends on the type of mutation and its impact on receptor function, leading to partial (partial AIS) or complete (complete AIS) insensitivity to androgens.

Risk Factors

• Genetic mutations in the androgen receptor gene.
• Family history of AIS or related disorders.
• Sporadic mutations in individuals with no family history.

Symptoms

• Ambiguous genitalia at birth (in partial AIS).
• Primary amenorrhea (absence of menstruation) in adolescents.
• Infertility or reduced fertility.
• Lack of or sparse body hair (in complete AIS).
• Normal breast development (due to estrogen conversion from androgens).

Diagnosis

Diagnosis involves clinical evaluation of physical characteristics, hormone level testing (elevated testosterone with normal or elevated LH/FSH), and genetic testing for androgen receptor mutations. Imaging or biopsy may assess gonadal tissue, and karyotyping confirms XY chromosome status.

Treatment Options

Treatment focuses on managing symptoms and may include:

• Hormone therapy to support bone health or feminization.
• Surgical intervention for gonadal removal (if at risk of cancer) or genital reconstruction.
• Fertility counseling or assisted reproductive technologies.
• Psychological support for gender identity and body image.

Prognosis and Follow-Up

Prognosis is generally good with appropriate management, though infertility is common. Regular follow-up includes monitoring for gonadal tumors, bone density, and psychosocial well-being. Early diagnosis and multidisciplinary care improve outcomes.

Complications

• Increased risk of gonadal tumors (e.g., gonadoblastoma) if gonads are retained.
• Osteoporosis due to estrogen deficiency.
• Psychosocial challenges related to gender identity or body image.
• Infertility or reduced fertility.

Lifestyle & Prevention

• Genetic counseling for families with a history of AIS.
• Regular medical monitoring to detect complications early.
• Supportive care for psychosocial and gender-related concerns.
• Bone health maintenance through diet and exercise.

When to Seek Professional Help

Seek care if:

• Ambiguous genitalia is noted at birth.
• Adolescents experience primary amenorrhea or lack of puberty signs.
• Infertility or hormonal imbalances are suspected.
• Psychosocial distress related to gender or body image arises.

Tips for Medical Coders

Document the degree of androgen insensitivity (complete or partial) and any associated complications (e.g., gonadal tumors) to support code specificity. Include details on genetic testing or clinical findings that confirm the diagnosis. Ensure documentation aligns with the clinical presentation to justify the E34.5 code.