ICD-10 Code H16.329 – Diffuse interstitial keratitis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.329 – Diffuse interstitial keratitis, unspecified eye
What it is
This code identifies diffuse interstitial keratitis affecting an unspecified eye. It refers to inflammation within the corneal stroma, without a documented right or left eye.
Clinical signs
Typical findings include corneal haze or stromal inflammation, with reduced visual clarity and eye redness. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents diffuse interstitial keratitis but does not specify which eye is involved. It also fits when the provider describes corneal stromal inflammation consistent with this diagnosis and laterality is missing or unspecified. Check documentation if the note is vague.
Do not use for
Do not use it when the affected eye is documented as right or left, or when the condition is a different type of keratitis. Do not guess laterality from context.
Coding tip
Verify laterality in the exam note, assessment, or ophthalmology report before selecting the unspecified-eye code.