Granular corneal dystrophy, bilateral

This code identifies a specific inherited eye disorder affecting both corneas, characterized by the accumulation of granular deposits within the corneal stroma. These deposits can lead to corneal opacification, visual impairment, and recurrent erosions. It is a form of corneal dystrophy, a group of genetic conditions causing progressive corneal clouding.

Apply this code when documentation clearly states a diagnosis of granular corneal dystrophy affecting both eyes. This diagnosis is typically made based on slit-lamp examination findings and often confirmed by genetic testing or corneal biopsy. Use it for patients presenting with bilateral visual decline, photophobia, or foreign body sensation attributable to this condition.

• Ensure documentation specifies "bilateral" involvement; separate codes exist for unilateral granular corneal dystrophy.
• Distinguish from other corneal dystrophies (e.g., lattice, macular) which have different ICD-10-CM codes.
• Code any associated complications, such as corneal erosion (T85.63x, H16.2x), separately.