ICD-10 Code H01.01B – Ulcerative blepharitis left eye, upper and lower eyelids (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H01.01B – Ulcerative blepharitis left eye, upper and lower eyelids
What it is
This code identifies ulcerative blepharitis affecting both the upper and lower eyelids of the left eye. It describes an inflammatory eyelid disorder with ulceration at the lid margins.
Clinical signs
Typical findings include eyelid margin redness, crusting, scaling, and lash irritation. You may also see small ulcerations or collarettes at the base of the eyelashes; clinical features vary, refer to documentation.
When to use this code
Use this code when the record specifically documents ulcerative blepharitis of the left eye involving both upper and lower eyelids. It fits unilateral disease with ulcerative changes at the lid margins. Check documentation if laterality or eyelid involvement is unclear.
Do not use for
Do not use it for blepharitis without ulceration, or for right-sided, bilateral, or unspecified eyelid disease. If the note only says “blepharitis,” check documentation before assigning this code.
Coding tip
Confirm both laterality and eyelid involvement in the provider note before coding H01.01B.