ICD-10 Code H18.533 – Granular corneal dystrophy, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.533 – Granular corneal dystrophy, bilateral
What it is
Granular corneal dystrophy, bilateral is an inherited corneal disorder affecting both eyes. It causes deposits in the cornea that can gradually cloud vision.
Clinical signs
Typical findings include bilateral corneal opacities or granular deposits seen on eye examination. Symptoms may include blurred vision, glare, or reduced visual clarity; clinical features vary, so refer to documentation.
When to use this code
Use this code when the provider documents granular corneal dystrophy in both eyes. It is appropriate for confirmed bilateral disease, including ophthalmology notes describing corneal deposits or dystrophy affecting each cornea. Check documentation if laterality is unclear.
Do not use for
Do not use it for unilateral granular corneal dystrophy or for nonspecific corneal opacity without a documented dystrophy. Check documentation if the record only says corneal haze, scarring, or another corneal disorder.
Coding tip
Verify that the note specifies bilateral involvement before assigning H18.533.