ICD-10 Code H18.51 – Endothelial Corneal Dystrophy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.51 – Endothelial corneal dystrophy
What it is
Endothelial corneal dystrophy is a disorder of the inner corneal cell layer that can lead to corneal swelling and reduced clarity. Use this code when the diagnosis specifically identifies endothelial involvement.
Clinical signs
Common findings include corneal edema, blurred vision, and light sensitivity. Clinical features vary; refer to documentation for the specific dystrophy type or exam findings.
When to use this code
Use H18.51 when the provider documents endothelial corneal dystrophy, including cases described as endothelial degeneration or dystrophy of the corneal endothelium. Code it from ophthalmology notes, problem lists, or assessment sections when the diagnosis is established. Check documentation if the record only says corneal dystrophy without layer specification.
Do not use for
Do not use this code for corneal edema without a documented dystrophy, or for other corneal dystrophies involving different layers. Check documentation if the diagnosis is nonspecific or uncertain.
Coding tip
Capture the exact corneal layer named by the clinician; if endothelial disease is not stated, do not assume H18.51.