Corneal ectasia, bilateral

This code signifies a non-inflammatory thinning and bulging of the cornea, affecting both eyes. This progressive condition leads to an irregular corneal shape, causing distorted vision and often requiring specialized contact lenses or surgical intervention.

Apply this code when documentation clearly indicates corneal ectasia affecting both the right and left eyes. This diagnosis is typically supported by ophthalmological examination findings such as corneal topography showing irregular astigmatism, thinning, and protrusion.

• Ensure laterality is explicitly documented as "bilateral" or affecting "both eyes."
• Do not confuse with corneal degeneration (H18.5-) or other specific corneal disorders unless ectasia is also present.
• Code any underlying cause, such as keratoconus (H18.6x), if documented as the etiology of the ectasia.