ICD-10 Code H18.503 – Unspecified hereditary corneal dystrophies, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.503 – Unspecified hereditary corneal dystrophies, bilateral
What it is
This code identifies a hereditary corneal dystrophy affecting both eyes when the specific subtype is not documented. It indicates a bilateral, inherited corneal disorder with no further detail in the record.
Clinical signs
Findings may include corneal opacity, irregular corneal changes, reduced vision, or recurrent visual symptoms. Clinical features vary; refer to documentation.
When to use this code
Use H18.503 when the provider documents a hereditary corneal dystrophy in both eyes but does not specify the exact type. It is also appropriate when the chart confirms bilateral involvement and inherited corneal disease, yet the subtype remains unclear. Check documentation if the laterality or diagnosis is more specific.
Do not use for
Do not use this code for a named corneal dystrophy when the subtype is documented, or when the condition is limited to one eye. Check documentation for a more specific code.
Coding tip
If the record names the dystrophy, code the specific diagnosis instead of this unspecified bilateral option.