Fistula, left ankle

This code signifies the presence of an abnormal, pathological tract or channel connecting two epithelialized surfaces, or an epithelialized surface to a hollow organ, specifically located in the left ankle region. This tract typically allows for the passage of fluids, pus, or other substances.

Apply this code when documentation clearly indicates a fistula affecting the left ankle. This includes both external fistulas (opening to the skin surface) and internal fistulas within the ankle joint or surrounding tissues. Supporting documentation would include physician notes detailing the presence, location, and laterality of the fistula.

• Ensure laterality is explicitly documented as "left ankle"; if unspecified, a different code for unspecified laterality would be used.
• Distinguish between a true fistula and a sinus tract; a sinus tract has only one opening, while a fistula has two.
• Code any underlying cause or associated infection of the fistula if known and documented, sequencing it appropriately.