H18.613 Keratoconus, stable, bilateral

Name of the Condition

• Keratoconus, stable, bilateral (ICD Code: H18.613)

Summary

Keratoconus, stable, bilateral, refers to a non-progressive form of keratoconus affecting both eyes where the cornea has thinned and bulged into a cone-like shape but is not actively worsening. This condition results in distorted vision due to irregular astigmatism, though the structural changes remain stable over time. It typically affects both eyes asymmetrically and may require ongoing management to maintain visual function.

Causes

The exact cause of keratoconus is not fully understood, but it is thought to involve a combination of genetic predisposition, environmental factors, and hormonal influences. Some cases may be associated with systemic conditions or eye trauma, though many occur without a clear underlying trigger. In the stable phase, the corneal changes have ceased progressing, but the underlying structural abnormalities persist.

Risk Factors

• Family history of keratoconus
• Chronic eye rubbing or irritation
• Allergic conditions (e.g., atopic dermatitis, asthma)
• Certain connective tissue disorders (e.g., Ehlers-Danlos syndrome)
• Down syndrome

Symptoms

• Blurred or distorted vision
• Increased sensitivity to light and glare
• Frequent changes in eyeglass or contact lens prescriptions
• Difficulty seeing at night or in low light
• Eye strain or headaches

Diagnosis

Diagnosis involves a comprehensive eye examination, including corneal topography to detect the characteristic cone-like shape and thinning. Slit-lamp examination may reveal corneal scarring or irregularities. Additional tests, such as pachymetry to measure corneal thickness, help confirm the diagnosis and assess stability.

Treatment Options

Treatment focuses on correcting vision and managing symptoms. Options include eyeglasses or soft contact lenses for mild cases, rigid gas permeable lenses for more advanced cases, and corneal cross-linking to strengthen the cornea. In severe cases, corneal transplantation may be necessary.

Prognosis and Follow-Up

The prognosis for stable keratoconus is generally favorable, as the condition is not progressing. Regular follow-up with an eye care professional is essential to monitor for any changes and adjust treatment as needed. Most patients maintain functional vision with appropriate management.

Complications

Potential complications include corneal scarring, which can worsen vision, and hydrops (sudden corneal swelling) in rare cases. If left untreated, severe keratoconus may lead to significant visual impairment.

Lifestyle & Prevention

Avoid eye rubbing to prevent further corneal damage. Protect the eyes from trauma and UV exposure. Follow prescribed treatment plans, including wearing corrective lenses as directed, to maintain visual stability.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden vision changes, increased eye pain, or signs of corneal swelling. Regular check-ups are recommended to monitor the condition and adjust treatment as needed.

Tips for Medical Coders

Document the bilateral nature of the condition and confirm stability through clinical notes or diagnostic tests. Ensure the code H18.613 is used only when the condition is confirmed as non-progressive in both eyes. Include details about visual impairment or treatment plans to support medical necessity.