Rupture in Descemet's membrane, unspecified eye

This code describes a tear or break in Descemet's membrane, the innermost layer of the cornea, in an unspecified eye. This rupture can lead to corneal edema and vision impairment due to the disruption of the corneal endothelial barrier function. It often occurs secondary to conditions like congenital glaucoma, hydrops in keratoconus, or trauma.

Use this code when documentation clearly states a rupture of Descemet's membrane but does not specify laterality (right or left eye). This diagnosis is typically made via slit-lamp examination. Supporting documentation should include findings such as corneal edema, folds in Descemet's membrane, or a visible tear.

• Avoid using this code if the laterality of the affected eye is documented; instead, use the more specific codes for right (H18.331) or left (H18.332) eye.
• Always code any underlying cause or associated condition, such as keratoconus with acute hydrops (H18.6xx) or congenital glaucoma (Q15.0), as a primary or secondary diagnosis.
• Ensure the physician's documentation explicitly states "rupture of Descemet's membrane" or similar terminology to support this diagnosis.