ICD-10 Code H16.203 – Unspecified keratoconjunctivitis, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.203 – Unspecified keratoconjunctivitis, bilateral
What it is
H16.203 identifies inflammation involving both the cornea and conjunctiva when the specific type is not documented. Use it when the record states bilateral keratoconjunctivitis but does not name a cause or subtype.
Clinical signs
Typical findings may include red eyes, irritation, tearing, foreign-body sensation, and photophobia. Clinical features vary; refer to documentation for the exact presentation and whether the cornea is involved in both eyes.
When to use this code
Use this code when the clinician documents unspecified keratoconjunctivitis affecting both eyes. It fits cases where the diagnosis is clear, but the record does not identify allergic, viral, dry eye, or other specific causes. If laterality or etiology is documented elsewhere, code that information instead.
Do not use for
Do not use H16.203 when the chart specifies a different keratoconjunctivitis type or a single-eye condition. Check documentation if the note describes isolated conjunctivitis, keratitis, or another defined disorder.
Coding tip
Before assigning H16.203, confirm that bilateral involvement and “unspecified” wording are both documented.