ICD-10 Code H18.549 – Lattice Corneal Dystrophy, Unspecified Eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.549 – Lattice corneal dystrophy, unspecified eye
What it is
This code identifies lattice corneal dystrophy when the affected eye is not specified. It refers to an inherited corneal disorder with amyloid deposits that can cloud the cornea and affect vision.
Clinical signs
Typical findings include branching, lattice-like corneal opacities, recurrent corneal erosions, and reduced visual clarity. Clinical features vary; refer to documentation.
When to use this code
Use H18.549 when the provider documents lattice corneal dystrophy but does not name the right or left eye. It also fits when laterality is unavailable in the record. If the chart specifies a different corneal dystrophy, code that condition instead.
Do not use for
Do not use this code if the documentation identifies a specific eye, because a laterality-specific code may apply. Do not use it for other corneal dystrophies or non-dystrophic corneal scars; check documentation.
Coding tip
Before assigning H18.549, verify that the note supports lattice corneal dystrophy and that laterality is truly unspecified.