Peritoneal abscess

This code signifies a localized collection of pus within the peritoneal cavity, often resulting from an intra-abdominal infection or inflammation. It represents an encapsulated infection of the peritoneum, which is the membrane lining the abdominal cavity and covering the abdominal organs.

Apply this code when documentation clearly indicates a diagnosed peritoneal abscess, such as a subphrenic, pelvic, or paracolic abscess. Supporting documentation typically includes imaging reports (e.g., CT scan, ultrasound) confirming the abscess, operative reports detailing drainage, or physician notes explicitly stating the diagnosis.

• Differentiate from generalized peritonitis (K65.0) which involves widespread inflammation without a localized pus collection.
• Code any underlying cause of the abscess (e.g., appendicitis, diverticulitis) as a primary diagnosis when applicable, with the peritoneal abscess as a secondary diagnosis.
• Ensure the documentation specifies "abscess" rather than just "fluid collection" to support this specific code.