ICD-10 Code H16.391 – Other interstitial and deep keratitis, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.391 – Other interstitial and deep keratitis, right eye
What it is
This code identifies interstitial or deep inflammation of the cornea in the right eye that does not fit a more specific keratitis category. Use it when the provider documents this diagnosis for the right eye.
Clinical signs
Findings may include corneal stromal inflammation, haze, pain, redness, tearing, photophobia, or reduced vision. Clinical features vary; refer to documentation.
When to use this code
Use H16.391 when the record specifically states other interstitial or deep keratitis affecting the right eye. It is appropriate when the provider documents corneal involvement but does not name a more specific subtype. Check documentation if laterality is unclear or another keratitis diagnosis is recorded.
Do not use for
Do not use this code for keratitis of the left eye, both eyes, or unspecified eye. Also avoid it when the note describes a different corneal disorder or a more specific keratitis type.
Coding tip
Always confirm laterality and the exact corneal diagnosis before assigning H16.391.