Hordeolum externum unspecified eye, unspecified eyelid

This code signifies an external hordeolum, commonly known as a stye, affecting an unspecified eye and an unspecified eyelid. An external hordeolum is an acute, localized infection or inflammation of the glands of Zeis or Moll at the eyelid margin, typically presenting as a painful, red, and swollen lump.

Utilize this code when documentation confirms the presence of an external hordeolum without specifying laterality (right or left eye) or the specific eyelid involved (upper or lower). This code is appropriate when the physician's notes indicate "stye, unspecified eye" or "external hordeolum, eyelid not specified."

• Avoid using this code if the laterality (right or left eye) or specific eyelid (upper or lower) is documented; instead, choose a more specific code from the H00.01 series.
• Differentiate from an internal hordeolum (H00.02-), which involves the meibomian glands and is typically located further from the eyelid margin.
• Do not confuse with a chalazion (H00.1-), which is a chronic, sterile lipogranulomatous inflammation of a meibomian gland, often presenting as a painless lump.