ICD-10 Code H16.251 – Phlyctenular keratoconjunctivitis, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H16.251 – Phlyctenular keratoconjunctivitis, right eye
What it is
This code identifies phlyctenular keratoconjunctivitis affecting the right eye. It describes a localized inflammatory eye condition involving the conjunctiva and/or cornea.
Clinical signs
Typical findings include a small raised, inflamed lesion on the conjunctiva or cornea, with redness, irritation, tearing, or light sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use H16.251 when the clinician documents phlyctenular keratoconjunctivitis in the right eye specifically. It is appropriate when the record clearly identifies the laterality and the diagnosis, even if symptoms are described separately.
Choose this code for confirmed right-eye involvement rather than unspecified keratoconjunctivitis or a general corneal inflammation diagnosis. Check documentation if the note does not clearly distinguish the affected eye.
Do not use for
Do not use this code for left-eye or bilateral disease, or when the condition is documented without laterality. Check documentation if the note only says conjunctivitis, keratitis, or eye irritation.
Coding tip
Verify laterality in the assessment or impression before coding, because the wrong eye changes the ICD-10 code.