Endometriosis of extra-pelvic abdominal peritoneum

This code signifies the presence of endometrial tissue implants located on the abdominal peritoneum, outside of the pelvic cavity. This condition, known as extrapelvic endometriosis, can cause chronic pain, adhesions, and organ dysfunction depending on the affected area.

Apply this code when documentation explicitly states endometriosis affecting the abdominal peritoneum, excluding pelvic peritoneal involvement. This typically occurs in cases of widespread or severe endometriosis. Supporting documentation includes operative reports detailing findings during laparoscopy or laparotomy, pathology reports confirming endometrial tissue, and imaging studies.

• Differentiate carefully between pelvic and extrapelvic peritoneal involvement; N80.A- codes are for pelvic peritoneum.
• Always seek specific documentation of the location of the endometriosis to ensure accurate subcategory assignment.
• Code any associated complications, such as adhesions (K66.0) or chronic pain (R10.2), in addition to the endometriosis.