ICD-10 Code H18.50 – Unspecified hereditary corneal dystrophies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.50 – Unspecified hereditary corneal dystrophies
What it is
This code identifies a hereditary corneal dystrophy when the specific subtype is not documented. It applies to inherited, usually bilateral corneal disorders that affect the corneal tissue without naming a more precise diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include corneal clouding, deposits, opacities, recurrent erosions, or reduced vision, depending on the inherited dystrophy type.
When to use this code
Use H18.50 when the provider documents a hereditary corneal dystrophy but does not specify the exact subtype. It is also appropriate when the record confirms a familial corneal dystrophy and the chart lacks enough detail for a more specific code. Check documentation if laterality or subtype is clarified.
Do not use for
Do not use this code for nonhereditary corneal disease, corneal scars, or infectious keratitis. If the subtype is documented, code the more specific hereditary corneal dystrophy instead.
Coding tip
Query for the exact corneal dystrophy type whenever the note says only “corneal dystrophy” or “familial corneal opacity.”