ICD-10 Code H18.559 – Macular corneal dystrophy, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.559 – Macular corneal dystrophy, unspecified eye
What it is
H18.559 identifies macular corneal dystrophy when the affected eye is not specified. This is a corneal stromal dystrophy that causes progressive clouding of the cornea.
Clinical signs
Typical findings include bilateral corneal opacities, decreased visual acuity, and progressive corneal haze. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents macular corneal dystrophy but does not identify the right or left eye. It also fits notes that describe corneal dystrophy with macular pattern and no laterality. If the record names a specific eye, code that laterality instead.
Do not use for
Do not use H18.559 for other corneal dystrophies, nonspecific corneal opacity, or conditions limited to a documented right or left eye. Check documentation.
Coding tip
Confirm laterality in the ophthalmology note before assigning this unspecified-eye code.