ICD-10 Code H10.539 – Contact blepharoconjunctivitis, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H10.539 – Contact blepharoconjunctivitis, unspecified eye
What it is
This code identifies contact blepharoconjunctivitis affecting an unspecified eye. It means inflammation of the eyelid and conjunctiva caused by contact with an irritant or allergen, when the chart does not specify right or left eye.
Clinical signs
Typical findings include eyelid redness, conjunctival irritation, itching, tearing, and swelling after exposure to a triggering substance. Clinical features vary; refer to documentation.
When to use this code
Use H10.539 when the record documents contact blepharoconjunctivitis but does not identify the affected eye. It also fits cases where the clinician notes an external exposure, such as a chemical, cosmetic, or other irritant, and laterality is not stated. Check documentation if the cause is unclear.
Do not use for
Do not use this code for infectious conjunctivitis, allergic conjunctivitis without contact exposure, or blepharitis alone. If the note specifies a right or left eye, use the laterality-specific code instead.
Coding tip
Confirm both the contact cause and the missing laterality before assigning H10.539.