H18.042 Kayser-Fleischer ring, left eye

Name of the Condition

• Kayser-Fleischer Ring, Left Eye
• ICD Code: H18.042

Summary

Kayser-Fleischer ring, left eye, is a brownish or greenish ring of copper deposition in the cornea of the left eye, typically located at the limbus (the border between the cornea and sclera). This finding is a key clinical sign of Wilson disease, a genetic disorder affecting copper metabolism. The ring may be visible to the naked eye in advanced cases but is often detected via slit-lamp examination.

Causes

Kayser-Fleischer ring results from abnormal copper accumulation in the body due to impaired biliary excretion, a hallmark of Wilson disease. Copper deposits in the Descemet membrane of the cornea, forming the characteristic ring. The underlying cause is mutations in the ATP7B gene, which disrupts copper transport and elimination.

Risk Factors

• Genetic predisposition (family history of Wilson disease)
• Age (typically appears in late childhood or early adulthood)
• Untreated or poorly managed Wilson disease
• Lack of copper metabolism screening in at-risk individuals

Symptoms

• Often asymptomatic initially; may be detected during routine eye exams
• In advanced cases, potential visual disturbances (e.g., glare, blurred vision)
• Associated systemic symptoms of Wilson disease (e.g., liver dysfunction, neurological issues)

Diagnosis

Diagnosis involves slit-lamp examination to visualize the corneal ring. Additional tests, such as serum ceruloplasmin levels, 24-hour urinary copper excretion, and genetic testing for ATP7B mutations, may confirm Wilson disease. Liver function tests and imaging may also be performed to assess systemic involvement.

Treatment Options

Treatment focuses on managing Wilson disease to reduce copper accumulation. This includes chelation therapy (e.g., penicillamine, trientine) or zinc supplements to promote copper excretion. Regular monitoring of copper levels and liver function is essential. Ocular symptoms may improve with systemic treatment, but advanced cases may require additional interventions.

Prognosis and Follow-Up

With early diagnosis and consistent treatment, prognosis is favorable, and Kayser-Fleischer rings may regress. Untreated or delayed treatment can lead to progressive liver damage, neurological decline, or vision impairment. Lifelong follow-up is necessary to monitor copper levels, treatment efficacy, and potential complications.

Complications

• Progressive liver cirrhosis or failure
• Neurological deterioration (e.g., tremors, cognitive changes)
• Vision loss due to corneal damage or cataracts
• Hemolytic anemia in severe cases

Lifestyle & Prevention

• Adhere to prescribed copper-restricted diets and avoid copper-rich foods (e.g., shellfish, organ meats).
• Avoid supplements containing copper.
• Regular eye and liver check-ups for early detection.
• Genetic counseling for affected families to identify at-risk individuals.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Sudden vision changes or eye pain
• Jaundice, abdominal pain, or unexplained fatigue
• Neurological symptoms (e.g., difficulty walking, speech changes)
• Unexplained bruising or bleeding, indicating liver dysfunction.

Tips for Medical Coders

Document the eye laterality (left eye) and confirm the presence of Kayser-Fleischer ring via clinical examination or imaging. Ensure the code aligns with the patient’s diagnosis of Wilson disease or related copper metabolism disorder. Include supporting documentation of systemic symptoms or lab results if available to justify the code assignment.