Rectal fistula, complex, persistent

This code signifies a complex, chronic abnormal tract connecting the rectum to another organ or the perianal skin. A complex fistula often involves multiple tracts, branching, or involvement of significant portions of the anal sphincter, making it more challenging to treat than a simple fistula. "Persistent" indicates that the fistula has not resolved despite treatment or has been present for an extended period.

Apply this code when documentation clearly identifies a rectal fistula as complex and persistent. This typically applies to cases of recurrent fistulas, those with multiple external openings, or those involving a significant amount of sphincter muscle. Documentation should specify the complexity (e.g., "high," "transsphincteric," "suprasphincteric," "extrasphincteric," "multiple tracts") and the chronic nature or failure of previous treatments.

• Differentiate from simple rectal fistulas (K60.3) which are typically superficial and involve less sphincter muscle.
• Ensure the documentation explicitly states "complex" and "persistent" or provides details that unequivocally support these descriptors.
• Consider sequencing with codes for underlying conditions, such as Crohn's disease (K50.-), if the fistula is a complication of another disease.