Anal fistula, simple, persistent

This code signifies a simple anal fistula that has not resolved and continues to drain or cause symptoms. An anal fistula is an abnormal tunnel connecting the anal canal to the skin near the anus, typically resulting from an infection of an anal gland. A "simple" fistula generally involves a single, straight tract without significant branching or involvement of the sphincter muscles.

Use this code when documentation clearly indicates a diagnosis of an anal fistula that is described as "simple" and "persistent" or "chronic." This code is appropriate for ongoing management, evaluation, or treatment of a simple anal fistula that has not healed spontaneously or after initial interventions. Supporting documentation would include physician notes detailing the fistula's characteristics, its chronic nature, and lack of resolution.

• Ensure the documentation specifically uses terms like "simple" and "persistent" or "chronic" to accurately assign this code.
• Distinguish from complex anal fistulas (K60.4) which involve multiple tracts, high tracts, or significant sphincter involvement.
• Do not use for acute anal abscesses (K61.-) even though they can precede fistula formation.