ICD-10 Code H16.252 – Phlyctenular keratoconjunctivitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.252 – Phlyctenular keratoconjunctivitis, left eye
What it is
This code identifies phlyctenular keratoconjunctivitis affecting the left eye. It refers to a localized inflammatory eye condition involving the cornea and conjunctiva.
Clinical signs
Typical findings include a small, raised, inflammatory lesion with redness, irritation, tearing, and light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use H16.252 when the provider documents phlyctenular keratoconjunctivitis in the left eye specifically. You should also use it when the note clearly identifies the condition as unilateral and left-sided, even if laterality is supported by examination findings.
Do not use for
Do not use this code for nonspecific conjunctivitis, keratitis, or eye redness without a documented diagnosis. Check documentation if laterality is missing or if the condition is described in another eye.
Coding tip
Verify both the diagnosis and laterality in the ophthalmology note before assigning H16.252.