E74.29 Other disorders of galactose metabolism

Name of the Condition

• Other disorders of galactose metabolism (ICD-10 Code E74.29)

Summary

Other disorders of galactose metabolism are conditions that impair the body’s ability to process galactose, a sugar derived from lactose. These disorders involve disruptions in metabolic pathways, leading to the accumulation of galactose or its byproducts, which can cause symptoms or complications if not managed appropriately. This code category includes specific subtypes not classified under more detailed codes.

Causes

These disorders are typically caused by genetic mutations affecting enzymes or transporters involved in galactose breakdown. The specific defect may involve enzymes like galactokinase (GALK) or UDP-galactose-4-epimerase (GALE), or other components of the galactose metabolic pathway. The exact genetic or enzymatic cause varies by subtype.

Risk Factors

• Genetic predisposition or family history of galactose metabolism disorders.
• Newborns or infants, as symptoms often present early with dietary exposure to lactose.
• Specific ethnic or population groups may have higher prevalence of certain subtypes.

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 in severe or untreated cases.

Diagnosis

Diagnosis involves clinical evaluation of symptoms, dietary history, and laboratory testing. Blood or urine tests may detect elevated galactose levels or abnormal metabolites. Enzyme activity assays or genetic testing can identify specific defects. Newborn screening may also detect these disorders in asymptomatic infants.

Treatment Options

Treatment typically involves a galactose-restricted diet, eliminating lactose and galactose-containing foods. In some cases, enzyme replacement therapy or supportive care for complications (e.g., cataracts) may be necessary. Long-term management focuses on dietary adherence and monitoring for metabolic stability.

Prognosis and Follow-Up

Prognosis depends on the specific subtype and timeliness of treatment. Early diagnosis and strict dietary management can prevent severe complications. Regular follow-up with a metabolic specialist is recommended to monitor growth, development, and metabolic status. Lifelong dietary restrictions are often required.

Complications

• Cataracts or other eye problems.
• Developmental delays or intellectual disability.
• Liver damage or failure.
• Kidney dysfunction.
• Ovarian insufficiency in females (in some subtypes).

Lifestyle & Prevention

• Adhere to a strict galactose-free diet, avoiding milk, dairy products, and foods with hidden galactose.
• Read food labels carefully and consult a dietitian for guidance.
• Inform caregivers, schools, or childcare providers about dietary restrictions.
• Carry medical identification indicating the condition and dietary needs.

When to Seek Professional Help

Seek immediate medical attention if symptoms like jaundice, vomiting, lethargy, or poor feeding occur in infants, especially after milk exposure. Consult a healthcare provider for persistent symptoms, dietary concerns, or if complications (e.g., cataracts, developmental delays) are suspected.

Tips for Medical Coders

Document the specific subtype of galactose metabolism disorder when known (e.g., GALK deficiency, GALE deficiency) to support accurate coding. If the subtype is unspecified, use E74.29. Include details on diagnostic testing, dietary management, or complications to clarify the clinical context. Ensure documentation aligns with the specific metabolic pathway affected.