ICD-10 Code H10.521 – Angular blepharoconjunctivitis, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.521 – Angular blepharoconjunctivitis, right eye
What it is
This code identifies angular blepharoconjunctivitis affecting the right eye. It refers to inflammation at the eyelid margins and inner or outer eye corners, limited to the right side.
Clinical signs
Typical findings include redness, irritation, crusting, and discomfort at the eyelid angle. Clinical features vary; refer to documentation for laterality and whether the conjunctiva and eyelid margin are both involved.
When to use this code
Use H10.521 when the provider documents angular blepharoconjunctivitis in the right eye. Code it when the record clearly specifies right-sided involvement and does not describe a different conjunctival disorder.
If laterality is documented elsewhere in the note, make sure it matches the diagnosis statement. Check documentation when the chart only says “angular conjunctivitis” or “blepharitis” without clear eye-side detail.
Do not use for
Do not use this code for bilateral or left-eye disease, or for nonspecific conjunctivitis without angular involvement. Check documentation if the note describes blepharitis alone or another eye infection.
Coding tip
Verify both the condition name and the right-eye laterality before assigning H10.521.