Rectal fistula, complex, unspecified

This code signifies a complex abnormal tract connecting the rectum to another organ or the skin, where the specific anatomical connections are not documented. "Complex" implies multiple tracts, involvement of the sphincter muscle, or a horseshoe configuration, without further specification.

Apply this code when documentation clearly states a "complex rectal fistula" but lacks details regarding the specific anatomical opening or associated conditions. It is appropriate when the complexity is noted, but the exact type (e.g., rectovaginal, rectovesical) is not specified.

• Do not use this code if the specific anatomical connection of the fistula is known; instead, use a more specific code from the K60.4- series.
• Ensure documentation supports the "complex" nature of the fistula; otherwise, consider K60.3 (Anal fistula, unspecified).
• Code any underlying conditions or complications (e.g., Crohn's disease, abscess) separately.