1. K61 Abscess of anal and rectal regions

    Includes:

    • abscess of anal and rectal regions
    • cellulitis of anal and rectal regions
    1. K61.0 Anal abscess

      Inclusion term(s):

      • Perianal abscess
    2. K61.1 Rectal abscess

      Inclusion term(s):

      • Perirectal abscess
    3. K61.2 Anorectal abscess

    4. K61.3 Ischiorectal abscess

      1. K61.31 Horseshoe abscess

      2. K61.39 Other ischiorectal abscess

        Inclusion term(s):

        • Abscess of ischiorectal fossa
        • Ischiorectal abscess, NOS
    5. K61.4 Intrasphincteric abscess

      Inclusion term(s):

      • Intersphincteric abscess
    6. K61.5 Supralevator abscess

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.