ICD-10 Code H00.0 – Hordeolum (externum) (internum) of eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.0 – Hordeolum (externum) (internum) of eyelid
What it is
H00.0 identifies a stye, also called hordeolum, involving the eyelid. It refers to an acute infection or inflammation of an eyelid gland, either on the outside or inside of the lid.
Clinical signs
Typical findings include a localized, tender eyelid lump with redness and swelling. Clinical features vary; refer to documentation if the record does not clearly state whether the lesion is external or internal.
When to use this code
Use H00.0 when the provider documents hordeolum, stye, or a similar acute eyelid gland infection. This code fits cases limited to the eyelid and not broader eye conditions. If the note specifies externum or internum, code H00.0 still applies.
Do not use for
Do not use this code for chalazion, blepharitis, or other noninfectious eyelid masses unless documentation clearly supports hordeolum. Check documentation when the eyelid swelling is nonspecific.
Coding tip
Look for the provider’s exact wording and laterality details; if the record only says “eyelid swelling,” query or code only what is documented.