ICD-10 Code H00.1 – Chalazion (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.1 – Chalazion
What it is
H00.1 identifies a chalazion, a localized eyelid lump caused by blockage and inflammation of a meibomian gland. It is usually a benign, noninfectious lesion.
Clinical signs
You may see a firm, round, usually painless nodule in the eyelid. Clinical features vary; refer to documentation for tenderness, redness, or visual impact.
When to use this code
Use H00.1 when the provider documents chalazion of the eyelid, including a stye-like or meibomian gland cyst diagnosis. Code it from the documented site and laterality when available. If the note describes a different eyelid disorder or active infection, confirm the diagnosis before assigning this code.
Do not use for
Do not use H00.1 for hordeolum, eyelid cellulitis, or nonspecific eyelid swelling. Check documentation if the lesion is described as infected or if the diagnosis is uncertain.
Coding tip
Capture laterality and eyelid location from the note whenever the record supports it.