ICD-10 Code H18.3 – Changes of corneal membranes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H18.3 – Changes of corneal membranes
What it is
H18.3 refers to structural changes affecting the corneal membranes. Use this code when documentation describes an abnormal corneal membrane condition, not a specific corneal ulcer, scar, or dystrophy.
Clinical signs
Findings may include corneal opacity, surface irregularity, or membrane-related changes noted on slit-lamp examination. Clinical features vary; refer to documentation.
When to use this code
Use H18.3 when the provider documents a change in the corneal membranes without naming a more specific diagnosis. It may apply to ophthalmology notes describing membrane abnormality, degeneration, or other non-specific corneal membrane change. Check documentation if the record also mentions a distinct corneal disorder.
Do not use for
Do not use this code for corneal ulcer, keratitis, scar, or dystrophy when a more specific diagnosis is documented. Check documentation.
Coding tip
Code the most specific corneal diagnosis available; use H18.3 only when the chart clearly describes membrane changes and no better code is stated.