ICD-10 Code H01.00B – Unspecified blepharitis left eye, upper and lower eyelids (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H01.00B – Unspecified blepharitis left eye, upper and lower eyelids
What it is
This code identifies blepharitis affecting both the upper and lower eyelids of the left eye when the type is not specified. It means inflammation of the eyelid margins, but the documentation does not name a more specific cause.
Clinical signs
Common findings include eyelid redness, irritation, crusting, itching, burning, or a gritty sensation. Clinical features vary; refer to documentation for laterality and whether both left upper and lower lids are involved.
When to use this code
Use this code when the provider documents unspecified blepharitis of the left eye involving both upper and lower eyelids. It is appropriate when the record confirms blepharitis but does not identify anterior, posterior, or another specific type. Check documentation if the note only says “blepharitis” without laterality or lid detail.
Do not use for
Do not use this code if the chart specifies another blepharitis type or a different eye or eyelid laterality. Do not assign it when the diagnosis is uncertain or when symptoms are present without a documented diagnosis.
Coding tip
Verify that the note clearly states left eye and both upper and lower eyelids before assigning H01.00B.