ICD-10 Code H18.229 – Idiopathic corneal edema, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.229 – Idiopathic corneal edema, unspecified eye
What it is
This code identifies corneal swelling of unknown cause in an unspecified eye. Use it when the record states idiopathic corneal edema and does not specify right or left eye.
Clinical signs
Clinical features vary; refer to documentation. Commonly, corneal edema is noted on eye examination as corneal clouding, thickening, or loss of clarity, with symptoms such as blurred vision or glare.
When to use this code
Use H18.229 when the provider documents idiopathic corneal edema and the affected eye is not identified. It is also appropriate when the chart confirms corneal edema without a documented cause, and the condition is described as idiopathic. If laterality is recorded elsewhere, code the specified eye instead.
Do not use for
Do not use this code when corneal edema has a documented cause, such as postoperative change, inflammation, trauma, or dystrophy. Check documentation if the eye is specified or if another corneal disorder better explains the finding.
Coding tip
Confirm both laterality and etiology in the note before assigning H18.229.