ICD-10 Code H16.393 – Other interstitial and deep keratitis, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.393 – Other interstitial and deep keratitis, bilateral
What it is
Use this code for inflammation affecting the deeper layers of the cornea in both eyes. It describes bilateral interstitial or deep keratitis when the documentation does not specify a more exact cause.
Clinical signs
Findings may include corneal haze, stromal inflammation, pain, redness, photophobia, and reduced vision. Clinical features vary; refer to documentation.
When to use this code
Use H16.393 when the provider documents bilateral deep or interstitial keratitis and does not identify a more specific corneal disorder. It may apply when the note clearly states both eyes are involved and the condition is not coded elsewhere.
Do not use for
Do not use this code for superficial keratitis, isolated corneal ulcer, or keratitis with a more specific documented cause. If laterality is not bilateral, choose the appropriate unilateral or unspecified code. Check documentation.
Coding tip
Confirm that the record supports both eyes and that “deep” or “interstitial” keratitis is explicitly documented before assigning H16.393.