Hordeolum externum right eye, unspecified eyelid

This code describes an acute, localized inflammation of the sebaceous glands of Zeis or Moll glands on the outer surface of the right eyelid. It presents as a painful, red, and swollen lesion, often resembling a pimple or boil. This condition is commonly known as a stye.

Apply this code when documentation specifies an external hordeolum affecting the right eye, without further detail regarding the specific eyelid (upper or lower). This diagnosis is typically supported by physician notes detailing the characteristic clinical presentation of a stye on the right eyelid.

• Ensure documentation specifies "externum" to differentiate from an internal hordeolum (chalazion).
• Verify laterality (right eye) is clearly documented.
• If the specific eyelid (upper or lower) is documented, a more specific code within the H00.01- series should be used.