ICD-10 Code H18.232 – Secondary corneal edema, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.232 – Secondary corneal edema, left eye
What it is
H18.232 identifies corneal swelling in the left eye that occurs secondary to another eye condition or prior insult. Use it when documentation states the edema is not primary and is limited to the left eye.
Clinical signs
Typical findings include corneal haze, thickening, and reduced clarity on examination. Clinical features vary; refer to documentation for the underlying cause and whether the edema is described as secondary.
When to use this code
Use this code when the provider documents secondary corneal edema affecting only the left eye, such as after surgery, inflammation, trauma, or another corneal disorder. Code the documented underlying condition as well when instructed by the record and coding guidelines.
Do not use for
Do not use H18.232 for primary corneal edema or edema in the right eye or both eyes. If the note does not clearly state secondary and left-sided involvement, check documentation.
Coding tip
Confirm laterality and the cause in the ophthalmology note before assigning H18.232.