ICD-10 Code H18.20 – Unspecified corneal edema (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.20 – Unspecified corneal edema
What it is
H18.20 identifies corneal swelling when the record does not specify the cause or the affected eye. Use this code when documentation states corneal edema without further detail.
Clinical signs
Clinical features may include a hazy or cloudy cornea, blurred vision, and light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use H18.20 when the provider documents corneal edema but does not identify whether it is due to surgery, trauma, dystrophy, or another condition. It also fits cases where the laterality or cause is not recorded. Check documentation before coding a more specific corneal disorder.
Do not use for
Do not use this code if the chart identifies a specific cause of corneal edema or a more precise corneal diagnosis. If the edema is linked to another condition, code the underlying condition instead when instructed.
Coding tip
Look for cause, laterality, and postoperative context first; if missing, H18.20 is appropriate.