ICD-10 Code H16.301 – Unspecified interstitial keratitis, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.301 – Unspecified interstitial keratitis, right eye
What it is
This code identifies interstitial keratitis in the right eye when the documentation does not specify the cause. It refers to inflammation involving the corneal stroma rather than the surface layer.
Clinical signs
Typical findings include corneal haze or opacity, redness, pain, photophobia, and reduced vision. Clinical features vary; refer to documentation if the record does not clearly confirm the diagnosis.
When to use this code
Use H16.301 when the provider documents interstitial keratitis affecting the right eye and does not name a more specific etiology. It is also appropriate when laterality is clear but the underlying cause remains unspecified. Check documentation if the note mentions bilateral disease or another corneal disorder.
Do not use for
Do not use this code for keratitis with a documented specific cause, such as infectious or autoimmune disease, unless the record still supports an unspecified diagnosis. Do not assign it if the condition is in the left eye or both eyes.
Coding tip
Verify laterality and whether the provider documented an underlying cause before selecting this unspecified code.