ICD-10 Code H00.015 – Hordeolum externum left lower eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.015 – Hordeolum externum left lower eyelid
What it is
This code identifies an external stye on the left lower eyelid. It is a localized infection or inflammation of an eyelid gland at the eyelid margin.
Clinical signs
You may see a painful, red, swollen nodule near the eyelid edge, sometimes with a small pustule. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents a hordeolum externum specifically on the left lower eyelid. It fits encounters for a new or ongoing external stye with clear laterality. If the note only says “stye” or does not specify the eyelid, check documentation.
Do not use for
Do not use this code for internal hordeolum, chalazion, or unspecified eyelid laterality. Check documentation if the record describes a different eyelid lesion or infection.
Coding tip
Verify both the external type and the left lower eyelid location before assigning H00.015.