ICD-10 Code H18.459 – Nodular corneal degeneration, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.459 – Nodular corneal degeneration, unspecified eye
What it is
This code identifies nodular corneal degeneration affecting an unspecified eye. It refers to a degenerative corneal change with nodular deposits or opacities, when the documentation does not specify right or left eye.
Clinical signs
Clinical features vary; refer to documentation. Typical charting may describe corneal nodules, opacity, surface irregularity, or reduced visual clarity noted on eye examination.
When to use this code
Use H18.459 when the provider documents nodular corneal degeneration and does not identify the affected eye. You may also use it when laterality is unclear in the record. If the note specifies right or left eye, code that laterality instead.
Do not use for
Do not use this code for other corneal degeneration types or for corneal findings without a confirmed diagnosis. Check documentation if the condition is described as scarring, dystrophy, or another corneal disorder.
Coding tip
Always confirm laterality first; unspecified-eye codes are appropriate only when the chart truly lacks right-or-left detail.