Hordeolum internum right lower eyelid

This code signifies an internal hordeolum, commonly known as a stye, located on the right lower eyelid. An internal hordeolum is an acute bacterial infection of a meibomian gland within the tarsal plate, presenting as a painful, red, and swollen lesion.

Use this code when documentation clearly indicates an internal hordeolum affecting the lower eyelid of the patient's right eye. Supporting documentation should specify the location (lower eyelid) and laterality (right eye) of the stye.

• Differentiate from an external hordeolum (stye of Zeis or Moll gland), which has different ICD-10-CM codes.
• Ensure laterality (right vs. left) and eyelid (upper vs. lower) are explicitly documented to select the most specific code.
• Do not confuse with chalazion (H00.1-), which is a chronic, sterile lipogranulomatous inflammation of a meibomian gland.