Hordeolum externum left eye, unspecified eyelid

This code signifies an external hordeolum, commonly known as a stye, affecting the left eye. It is an acute, localized infection of the sebaceous glands (glands of Zeis) or apocrine glands (glands of Moll) of the eyelid margin. This specific code indicates that the exact eyelid (upper or lower) is not documented.

Use this code when documentation clearly states an external hordeolum is present on the left eye, but the specific eyelid (upper or lower) is not specified. This code is appropriate when the provider's notes confirm the diagnosis of a stye on the left eye without further anatomical detail.

• Ensure documentation specifies "externum" to differentiate from internal hordeolum.
• Avoid using this code if the specific eyelid (upper or lower) is documented; instead, use the more specific codes (H00.013 or H00.014).
• Always verify laterality (left eye) is explicitly stated in the clinical record.