ICD-10 Code H16.303 – Unspecified interstitial keratitis, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.303 – Unspecified interstitial keratitis, bilateral
What it is
This code identifies interstitial keratitis affecting both eyes when the specific cause is not documented. It refers to inflammation within the cornea rather than the surface layer.
Clinical signs
Findings may include bilateral corneal haze, stromal inflammation, photophobia, redness, and blurred vision. Clinical features vary; refer to documentation.
When to use this code
Use H16.303 when the record clearly states interstitial keratitis in both eyes and does not name a more specific etiology. Apply it when the provider documents the condition as unspecified, even if the workup is incomplete. Check documentation if laterality or cause is unclear.
Do not use for
Do not use this code for keratitis limited to one eye or for a specific interstitial keratitis cause that has its own documented diagnosis. Do not assign it if the chart only says corneal inflammation without interstitial keratitis.
Coding tip
Confirm both laterality and the word “unspecified” in the provider note before assigning H16.303.