ICD-10 Code H00.025 – Hordeolum internum left lower eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.025 – Hordeolum internum left lower eyelid
What it is
H00.025 identifies an internal stye in the left lower eyelid. It is an infection or inflammation of a meibomian gland within that eyelid.
Clinical signs
Typical findings include localized eyelid swelling, tenderness, and redness on the inner lid surface. Clinical features vary; refer to documentation if the laterality or internal location is unclear.
When to use this code
Use this code when the record clearly documents a hordeolum internum affecting the left lower eyelid. It fits encounters for a confirmed internal stye, whether newly diagnosed or being followed.
If the note only says “stye” without eyelid location, you should not assume this code. Check documentation for internal versus external and for left lower eyelid specificity.
Do not use for
Do not use this code for external hordeolum, chalazion, or unspecified eyelid involvement. Check documentation when the diagnosis is vague or the laterality is not recorded.
Coding tip
Verify both “internal” and “left lower eyelid” in the provider note before assigning H00.025.