ICD-10 Code H18.223 – Idiopathic Corneal Edema, Bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.223 – Idiopathic corneal edema, bilateral
What it is
H18.223 identifies unexplained swelling of the cornea in both eyes. Use it when the chart documents bilateral corneal edema and no specific cause is stated.
Clinical signs
Typical findings include corneal haze or clouding, blurred vision, and possible light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents idiopathic corneal edema affecting both eyes and does not name a secondary cause. It may apply to office, ophthalmology, or hospital notes that clearly state bilateral involvement. If the record links the edema to surgery, trauma, dystrophy, or another disorder, check documentation for a more specific code.
Do not use for
Do not use it for corneal edema with an identified cause or for unilateral edema. Do not assign it when the note only says “corneal edema” without confirming idiopathic and bilateral status.
Coding tip
Confirm both laterality and the absence of an underlying cause before reporting H18.223.