ICD-10 Code H00.016 – Hordeolum externum left eye, unspecified eyelid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H00.016 – Hordeolum externum left eye, unspecified eyelid
What it is
This code identifies an external stye on the left eye when the affected eyelid is not specified. It refers to a localized eyelid infection or inflammation involving an external eyelid gland.
Clinical signs
Typical findings include a tender, red, swollen bump at the eyelid margin, sometimes with localized warmth or drainage. Clinical features vary; refer to documentation.
When to use this code
Use H00.016 when the record documents hordeolum externum of the left eye and does not name the upper or lower eyelid. You should code it from clinician documentation, not from assumption based on appearance alone. If the eyelid is later specified, choose the more precise code.
Do not use for
Do not use this code for internal hordeolum, chalazion, or nonspecific eyelid swelling without a documented stye. Check documentation if the note describes another eyelid disorder.
Coding tip
Verify laterality and whether the external or internal eyelid gland is involved before assigning the code.