Hordeolum externum left upper eyelid

This code represents an acute, localized inflammation of the glands of Zeis or Moll on the outer surface of the left upper eyelid, commonly known as an external stye. It presents as a painful, red, and tender bump, often with a visible pustule, along the eyelid margin.

Use this code when documentation clearly indicates a diagnosis of an external hordeolum affecting the left upper eyelid. This diagnosis is typically made based on visual inspection and patient symptoms. Supporting documentation would include notes describing the location, appearance, and symptoms of the stye.

• Differentiate from an internal hordeolum (chalazion) which involves the meibomian glands and has different codes.
• Ensure the laterality (left) and eyelid (upper) are explicitly documented to support this specific code.
• Do not confuse with blepharitis, which is a more generalized inflammation of the eyelid margins.