ICD-10 Code H16.209 – Unspecified keratoconjunctivitis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.209 – Unspecified keratoconjunctivitis, unspecified eye
What it is
This code identifies keratoconjunctivitis affecting an unspecified eye when the record does not name the right or left side. It indicates inflammation involving both the cornea and conjunctiva, without a more specific subtype documented.
Clinical signs
Typical findings include eye redness, irritation, tearing, foreign-body sensation, and light sensitivity. Clinical features vary; refer to documentation if the note does not clearly describe the laterality or exact keratoconjunctivitis type.
When to use this code
Use H16.209 when the provider documents keratoconjunctivitis but does not specify whether it is right or left eye. It also fits when the chart confirms the condition but leaves the laterality unclear. If the note gives a more specific diagnosis, code that instead.
Do not use for
Do not use this code if the record identifies the right or left eye, or if a more specific keratoconjunctivitis diagnosis is documented. Check documentation when the eye side or exact condition is missing.
Coding tip
Verify laterality in the assessment and eye exam before assigning H16.209.