Superficial endometriosis of the appendix

This code signifies the presence of endometrial-like tissue growing on the outer surface or within the wall of the appendix, but not deeply infiltrating the muscular layers. This ectopic tissue responds to hormonal fluctuations, potentially causing localized inflammation, pain, or adhesions. It represents a specific anatomical location for superficial endometriosis.

Use this code when documentation explicitly states "superficial endometriosis of the appendix" or similar phrasing indicating endometrial implants confined to the serosa or subserosal layers of the appendix. This diagnosis is often made incidentally during appendectomy or other abdominal surgeries, or suspected based on imaging and clinical presentation.

• Differentiate from deep infiltrating endometriosis of the appendix, which would be coded differently.
• Ensure documentation specifies "superficial" to accurately assign this code.
• Consider sequencing this code after any primary reason for the encounter, such as abdominal pain or appendicitis, if the endometriosis is an incidental finding.