Diverticulum of appendix

This code signifies the presence of an abnormal pouch or sac-like protrusion originating from the wall of the vermiform appendix. This diverticulum can be congenital or acquired and may contain fecal matter, leading to inflammation or other complications. It is distinct from appendicitis itself, though it can predispose to it.

Apply this code when documentation explicitly states the diagnosis of a diverticulum of the appendix. This typically occurs as an incidental finding during imaging studies (e.g., CT scan, ultrasound) or during surgical exploration of the abdomen for other conditions, such as suspected appendicitis.

• Do not confuse with appendicitis (K35-K37 series) unless appendicitis is also present and separately documented.
• If inflammation or perforation of the diverticulum is noted, use additional codes to specify the complication.
• Ensure the documentation clearly identifies the diverticulum as originating from the appendix, not other parts of the colon.