ICD-10 Code H16 – Keratitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16 – Keratitis
What it is
H16 identifies keratitis, an inflammation of the cornea. Use it when documentation states corneal inflammation without a more specific subtype.
Clinical signs
Common findings include eye pain, redness, tearing, light sensitivity, and blurred vision. Clinical features vary; refer to documentation.
When to use this code
Use H16 when the provider documents keratitis and does not specify a more detailed code. It may also fit nonspecific corneal inflammation noted on exam or in the assessment.
If the record names an infectious, ulcerative, or other specific corneal disorder, code the documented condition instead. Check documentation for laterality and any underlying cause.
Do not use for
Do not use H16 for corneal abrasion, corneal ulcer, or conjunctivitis. Those conditions are coded separately and should not be assumed to be keratitis.
Coding tip
Verify whether the note specifies infectious, interstitial, or other keratitis details before defaulting to the unspecified category.