Hordeolum internum left lower eyelid

This code signifies an internal hordeolum, commonly known as a stye, located on the inner surface of the left lower eyelid. It is an acute, localized infection of a meibomian gland, presenting as a painful, red, and swollen lump.

Apply this code when documentation clearly indicates an internal hordeolum affecting the left lower eyelid. The physician's notes should specify the laterality (left) and the eyelid involved (lower), along with the internal nature of the stye.

• Differentiate from external hordeolum (stye of Zeis or Moll gland) which has a different code.
• Ensure laterality and eyelid are precisely documented; "left lower eyelid" is crucial for this specific code.
• Do not confuse with chalazion, which is a sterile, chronic inflammation of a meibomian gland.