Hordeolum internum unspecified eye, unspecified eyelid

This code signifies an internal hordeolum, commonly known as a stye, located on the inner surface of the eyelid. It represents an acute, localized infection of a meibomian gland, characterized by a painful, red, and swollen lump. This specific code indicates that the affected eye and eyelid are not specified in the clinical documentation.

Use this code when documentation clearly states an internal hordeolum but does not specify laterality (left or right eye) or the exact eyelid (upper or lower). This code is appropriate when the provider's notes indicate "internal hordeolum, unspecified eye" or similar ambiguous phrasing regarding location.

• Avoid using this code if the laterality (right or left eye) or specific eyelid (upper or lower) is documented; instead, use a more specific code from the H00.02- subcategory.
• Distinguish from external hordeolum (H00.01-), which involves the glands of Zeis or Moll.
• Ensure documentation supports the "unspecified" nature; if laterality or eyelid is mentioned, query the provider for clarification if a more specific code cannot be determined.