Fistula of appendix

This code represents an abnormal, permanent communication or tract originating from the appendix to another organ or to the skin. This can result from inflammatory processes, surgical complications, or trauma, leading to the leakage of appendiceal contents.

Use this code when documentation clearly indicates the presence of a fistula directly involving the appendix. This typically includes post-operative fistulas following appendectomy, or fistulas arising from ruptured appendicitis or appendiceal abscesses. Supporting documentation would include operative reports, imaging studies (e.g., CT scans, fistulograms), and physician notes detailing the fistula's origin from the appendix.

• Differentiate from fistulas involving other parts of the gastrointestinal tract; ensure the appendix is the primary source.
• Code any underlying cause of the fistula (e.g., appendicitis, surgical complication) as an additional diagnosis.
• Specify if the fistula is internal (e.g., entero-appendiceal) or external (e.g., appendicocutaneous) if documented, though this code does not differentiate.