In simple words: A stye is a painful, red bump, similar to a pimple, that forms on the edge of the eyelid, near the eyelashes. It's caused by a bacterial infection.

This code represents both internal and external hordeola (styes) of the eyelid. An external hordeolum is an acute bacterial infection, typically caused by Staphylococcus aureus, affecting the eyelash follicles and the glands of Zeis or Moll. An internal hordeolum, which is less common, is an infection of the meibomian glands.

Example 1: A 35-year-old patient presents with a painful, red bump on the edge of their right upper eyelid. The area is tender to the touch. Upon examination, the physician diagnoses an external hordeolum., A 50-year-old patient with a history of blepharitis develops a swollen, red lump on the inner edge of their lower eyelid. The physician diagnoses an internal hordeolum., A child presents with a small, red bump near their eyelashes. The child reports it is slightly painful. The physician diagnoses an external hordeolum and recommends warm compresses.

Documentation should include the location (upper or lower eyelid, left or right eye), the type of hordeolum (internal or external), and associated symptoms such as pain, swelling, and redness. Any prior history of blepharitis or similar eye conditions should also be noted.