Anal fistula, unspecified

This code signifies the presence of an abnormal, uncharacterized tract connecting the anal canal or rectum to the perianal skin. It represents a chronic inflammatory condition, often resulting from a previous perianal abscess that failed to heal completely. The fistula allows for the passage of stool or pus from the bowel to the skin surface.

Use this code when documentation confirms an anal fistula but lacks specific details regarding its type (e.g., simple, complex, transsphincteric, intersphincteric, suprasphincteric, extrasphincteric). This code is appropriate when the physician's notes simply state "anal fistula" without further anatomical or etiological clarification.

• Avoid using this code if the documentation specifies the type or complexity of the anal fistula; instead, select a more specific K60.x code.
• Ensure the medical record clearly indicates the presence of a fistula, not just a perianal abscess (which codes to K61.x).
• Consider sequencing this code with codes for any associated conditions, such as Crohn's disease (K50.x) or ulcerative colitis (K51.x), if documented as causative.