ICD-10 Code H18.412 – Arcus senilis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.412 – Arcus senilis, left eye
What it is
Arcus senilis is a gray-white ring or arc at the corneal margin. This code identifies the finding in the left eye only.
Clinical signs
You may see a peripheral corneal opacity with a clear zone between the arc and the limbus. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents arcus senilis specifically in the left eye. It may appear as an incidental exam finding and does not by itself indicate active inflammation.
If the record names both eyes, use the appropriate bilateral code instead. If the documentation is vague, check documentation before assigning laterality.
Do not use for
Do not use this code for corneal opacities from trauma, infection, or other specified corneal disorders. Do not assume bilateral involvement unless it is documented.
Coding tip
Always capture laterality exactly as documented; left eye specificity is the key element for H18.412.