ICD-10 Code H00.012 – Hordeolum externum right lower eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.012 – Hordeolum externum right lower eyelid
What it is
H00.012 identifies a stye, or external hordeolum, on the right lower eyelid. It is an acute, localized infection of an eyelid gland or eyelash follicle.
Clinical signs
Typical findings include a painful, tender, red bump at the eyelid margin. You may also see localized swelling, warmth, and a small pustule; clinical features vary, so refer to documentation.
When to use this code
Use this code when the provider documents an external hordeolum specifically on the right lower eyelid. It fits cases described as a stye, eyelid abscess, or infected lash follicle on that side. Confirm laterality and location in the record before assigning the code.
Do not use for
Do not use H00.012 for a chalazion, internal hordeolum, or a lesion on a different eyelid or the opposite eye. Check documentation if the note only says “stye” without site details.
Coding tip
Always verify both laterality and whether the lesion is external before coding H00.012.