Descemetocele, left eye

This code signifies a descemetocele affecting the left eye. A descemetocele is a severe corneal ulceration where the corneal stroma has completely eroded, leaving only Descemet's membrane and the corneal endothelium intact, bulging forward due to intraocular pressure. This condition represents an impending corneal perforation.

Use this code when documentation explicitly states a descemetocele is present in the left eye. This diagnosis is typically made during an ophthalmological examination, often in the context of severe keratitis, corneal trauma, or infectious corneal ulcers. Supporting documentation should detail the extent of corneal thinning and the presence of a bulging Descemet's membrane.

• Ensure laterality is accurately documented; distinguish between left (2), right (1), and bilateral (3) involvement.
• Always code the underlying cause of the descemetocele (e.g., infectious keratitis, exposure keratopathy) first, if known, as the primary diagnosis.
• Do not confuse with less severe corneal ulcers or abrasions; a descemetocele implies near-perforation.