ICD-10 Code H00.026 – Hordeolum internum left eye, unspecified eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.026 – Hordeolum internum left eye, unspecified eyelid
What it is
This code identifies an internal stye in the left eye affecting an eyelid, without documentation of the upper or lower lid. It refers to an acute infection of a meibomian gland.
Clinical signs
Typical findings include localized eyelid pain, swelling, redness, and tenderness near the lid margin. The lesion is usually deeper than an external stye; clinical features vary, so refer to documentation.
When to use this code
Use H00.026 when the record clearly documents a hordeolum internum of the left eye and does not specify which eyelid is involved. You may also use it when the provider notes an internal stye, meibomian gland abscess, or similar wording for the left eye. Check documentation if laterality or lid location is unclear.
Do not use for
Do not use this code for chalazion, external hordeolum, or unspecified eyelid stye without left-eye documentation. If the chart does not confirm an internal lesion, check documentation.
Coding tip
Assign the code only when laterality is left and the eyelid is unspecified, because the site detail changes the correct ICD-10-CM selection.