ICD-10 Code H18.59 – Other hereditary corneal dystrophies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.59 – Other hereditary corneal dystrophies
What it is
This code identifies inherited corneal dystrophies that do not fit a more specific corneal dystrophy category. Use it for hereditary corneal disease affecting the cornea when the record does not name a different, specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings in corneal dystrophy may include bilateral corneal opacity, recurrent visual disturbance, glare, or reduced acuity, but the exact pattern depends on the hereditary subtype.
When to use this code
Use H18.59 when the provider documents an inherited corneal dystrophy and names it as “other” or does not specify a more precise hereditary corneal diagnosis. It is appropriate for confirmed corneal dystrophy with a familial or genetic basis. If the chart names a distinct corneal dystrophy, code that specific condition instead.
Do not use for
Do not use this code for nonhereditary corneal disorders, corneal scarring from injury, or infection-related corneal disease. If documentation is unclear, check documentation before assigning a hereditary code.
Coding tip
Look for wording such as “hereditary,” “familial,” or a named dystrophy; if the subtype is documented, choose the more specific code.