Hordeolum externum left lower eyelid

This code signifies an external hordeolum, commonly known as a stye, affecting the lower eyelid of the left eye. It is an acute, localized inflammation or infection of the sebaceous glands (glands of Zeis) or apocrine glands (glands of Moll) at the margin of the eyelid.

Apply this code when documentation clearly indicates a diagnosis of an external hordeolum specifically located on the left lower eyelid. Supporting documentation should include a physical examination noting the characteristic tender, red bump or pustule on the eyelid margin.

• Differentiate from internal hordeolum (chalazion), which involves the meibomian glands and has different ICD-10-CM codes.
• Ensure laterality (left) and eyelid location (lower) are explicitly documented to select the most specific code.
• Do not code for both an external hordeolum and a chalazion if they are the same lesion; a chalazion often develops from a chronic hordeolum.