Abscess of anal and rectal regions

This code represents a localized collection of pus in the tissues surrounding the anus or rectum, resulting from an infection. This can include perianal, ischiorectal, intersphincteric, or supralevator abscesses.

Use this code when documentation clearly indicates a diagnosis of an abscess in the anal or rectal region. Supporting documentation should specify the presence of pus, inflammation, and the anatomical location of the abscess. This code is appropriate for both initial diagnosis and subsequent encounters for treatment of the abscess.

• Do not use this code for fistulas, even if they originated from an abscess; use codes from category 565.
• Specify the exact anatomical location of the abscess if further detail is available in the documentation.
• Consider an additional code for the underlying cause of the abscess if known and documented (e.g., Crohn's disease).