Hordeolum internum left upper eyelid

This code signifies an internal hordeolum, commonly known as a stye, affecting the upper eyelid of the left eye. An internal hordeolum is an acute bacterial infection of a Meibomian gland, presenting as a painful, red, and swollen lump on the inside of the eyelid.

Use this code when documentation clearly indicates a diagnosis of an internal hordeolum located specifically on the left upper eyelid. This diagnosis is typically made based on clinical examination, noting the characteristic localized inflammation and tenderness.

• Differentiate from an external hordeolum (stye of Zeis or Moll gland), which has a different code.
• Ensure the laterality (left) and eyelid (upper) are explicitly documented to support this specific code.
• Do not confuse with chalazion, which is a chronic, non-infectious granuloma of a Meibomian gland.