E74.21 Galactosemia

Name of the Condition

• Galactosemia (ICD-10 Code E74.21)

Summary

Galactosemia is a genetic disorder that impairs the body’s ability to metabolize galactose, a sugar derived from lactose (milk sugar). This condition results in the accumulation of galactose and its byproducts, which can lead to symptoms and complications if not managed. Early diagnosis and dietary management are critical to prevent long-term effects.

Causes

Galactosemia is caused by genetic mutations that affect the enzyme galactose-1-phosphate uridylyltransferase (GALT), which is essential for breaking down galactose. These mutations are inherited in an autosomal recessive pattern, meaning an individual must inherit two defective copies of the gene (one from each parent) to develop the condition.

Risk Factors

• Genetic predisposition, particularly a family history of galactosemia.
• Newborns or infants, as symptoms typically appear shortly after lactose exposure.
• Certain ethnic groups may have a higher prevalence of specific genetic mutations.

Symptoms

• Jaundice (yellowing of the skin or eyes) in infants.
• Poor feeding, vomiting, or diarrhea after consuming milk or dairy products.
• Lethargy, irritability, or failure to thrive.
• Cataracts (clouding of the eye lens) in some cases.
• Developmental delays or intellectual disability if untreated.

Diagnosis

Diagnosis involves clinical evaluation of symptoms, followed by laboratory testing. Newborn screening programs often detect galactosemia by measuring GALT enzyme activity or galactose levels in blood. Confirmatory testing may include genetic analysis to identify specific mutations.

Treatment Options

• Immediate removal of galactose and lactose from the diet, typically by avoiding milk and dairy products.
• Use of specialized formulas and dietary supplements to ensure adequate nutrition.
• Regular monitoring of growth, development, and metabolic markers.
• In some cases, enzyme replacement therapy or other supportive treatments may be considered.

Prognosis and Follow-Up

With early diagnosis and strict dietary management, individuals with galactosemia can lead healthy lives. However, long-term follow-up is necessary to monitor for complications such as cognitive impairment, speech delays, or ovarian dysfunction in females. Lifelong adherence to a galactose-free diet is typically required.

Complications

• Developmental delays or intellectual disability if untreated.
• Speech and language difficulties.
• Ovarian insufficiency in females, potentially affecting fertility.
• Cataracts or other eye problems.
• Liver damage or failure in severe cases.

Lifestyle & Prevention

• Strict adherence to a galactose-free diet, avoiding all lactose-containing foods and beverages.
• Regular consultation with a dietitian to ensure nutritional balance.
• Monitoring of growth and development milestones.
• Avoidance of products containing hidden galactose, such as certain medications or processed foods.

When to Seek Professional Help

Seek medical attention if an infant shows signs of jaundice, poor feeding, vomiting, or lethargy after consuming milk. Early intervention is critical to prevent complications. Ongoing care from a healthcare provider specializing in metabolic disorders is recommended for long-term management.

Tips for Medical Coders

When coding for galactosemia (E74.21), ensure documentation supports the diagnosis, including clinical findings, laboratory results, and genetic testing if performed. Verify that the code is used for the specific subtype of galactosemia caused by GALT deficiency, as other subtypes may require different codes. Document dietary management and any associated complications to support comprehensive coding.