ICD-10 Code H10.12 – Acute atopic conjunctivitis, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.12 – Acute atopic conjunctivitis, left eye
What it is
H10.12 identifies acute atopic conjunctivitis affecting the left eye. It describes an allergic-type inflammation of the conjunctiva that is limited to that side.
Clinical signs
Typical findings include eye redness, itching, tearing, and conjunctival swelling. Clinical features vary; refer to documentation if the presentation is not clearly documented as atopic.
When to use this code
Use this code when the provider documents acute atopic conjunctivitis in the left eye. It also fits when the record clearly links the condition to the left eye and no other eye is involved.
If laterality is documented differently, code to match the note. Check documentation when the diagnosis is nonspecific or when another conjunctivitis type is described.
Do not use for
Do not use this code for unspecified conjunctivitis, bilateral disease, or conjunctivitis caused by infection, chemicals, or other non-atopic causes. Check documentation.
Coding tip
Verify both the atopic nature and the left-eye laterality before assigning H10.12.