ICD-10 Code H16.32 – Diffuse interstitial keratitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.32 – Diffuse interstitial keratitis
What it is
Diffuse interstitial keratitis is inflammation of the corneal stroma, the middle layer of the cornea. It can cause corneal haze and reduced transparency, affecting vision.
Clinical signs
Clinical features may include corneal clouding, redness, photophobia, tearing, and blurred vision. Findings can vary; refer to documentation for the specific pattern and laterality.
When to use this code
Use H16.32 when the provider documents diffuse interstitial keratitis by name. Apply it for confirmed corneal stromal inflammation, whether acute or chronic, when no more specific code is documented. Check the note for any associated cause or laterality details.
Do not use for
Do not use this code for superficial keratitis, corneal ulcer, or unspecified keratitis unless the record clearly states diffuse interstitial keratitis. Check documentation if the diagnosis is only suspected.
Coding tip
Code from the provider’s exact wording and verify whether an underlying condition or laterality is documented.