ICD-10 Code H18.899 – Other specified disorders of cornea, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.899 – Other specified disorders of cornea, unspecified eye
What it is
This code identifies a corneal disorder that does not fit a more specific diagnosis and the affected eye is not documented. Use it when the record names an “other specified” corneal condition without laterality.
Clinical signs
Findings depend on the underlying corneal problem and may include corneal opacity, irregular surface, pain, redness, tearing, photophobia, or blurred vision. Clinical features vary; refer to documentation.
When to use this code
Use H18.899 when the clinician documents a corneal disorder that is specified but not otherwise classified, and the chart does not state right or left eye. It is also appropriate when a laterality detail is missing and you cannot infer it from the note. Check documentation before assigning a more specific corneal code.
Do not use for
Do not use this code for unspecified corneal disorders without a qualifying “other specified” diagnosis. Do not use it when the record clearly identifies the right or left eye and a laterality-specific code is available.
Coding tip
Verify both the exact corneal diagnosis and laterality in the assessment before defaulting to this unspecified-eye code.