ICD-10 Code H00.024 – Hordeolum internum left upper eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.024 – Hordeolum internum left upper eyelid
What it is
This code identifies an internal hordeolum, or stye, on the left upper eyelid. It refers to an acute infection of an eyelid gland, usually causing a localized, tender lump.
Clinical signs
Typical findings include focal eyelid swelling, redness, and pain along the left upper lid margin. A small pustule or internal nodule may be present; clinical features vary, so refer to documentation.
When to use this code
Use H00.024 when the provider documents an internal stye specifically in the left upper eyelid. It is appropriate when laterality and eyelid location are clearly stated in the record.
If the note only says “hordeolum” without location, laterality, or internal versus external detail, check documentation before coding. Confirm the diagnosis is not a chalazion or another eyelid disorder.
Do not use for
Do not use this code for an external hordeolum, a chalazion, or a lesion on a different eyelid. Check documentation if the site or type is unclear.
Coding tip
Always verify both laterality and whether the hordeolum is internal before assigning H00.024.