Anorectal fistula, complex, initial

This code signifies an initial encounter for a complex anorectal fistula, which is an abnormal tract connecting the anal canal or rectum to the perianal skin. A complex fistula typically involves multiple tracts, high tracts, or tracts associated with significant tissue destruction, abscesses, or involvement of the sphincter muscle.

Use this code for a patient presenting with a newly diagnosed or previously untreated complex anorectal fistula. Documentation should clearly specify the complexity of the fistula, such as its high transsphincteric, suprasphincteric, or extrasphincteric nature, or the presence of multiple tracts or associated abscesses.

• Distinguish from simple fistulas (K60.3) which are typically low and superficial.
• Ensure documentation specifies "initial" encounter for this specific fistula.
• Code any associated conditions, such as Crohn's disease (K50.-) or abscess (K61.-), separately.