Deep endometriosis of the appendix

This code signifies the presence of endometrial tissue that has infiltrated deeply into the wall of the appendix. This condition is a form of extragenital endometriosis, specifically affecting the vermiform appendix. It can lead to symptoms mimicking appendicitis or other gastrointestinal issues.

Use this code when diagnostic imaging (e.g., ultrasound, CT, MRI) or surgical pathology confirms deep infiltration of endometrial implants within the appendix. Documentation should clearly state "deep endometriosis of the appendix" or describe findings consistent with deep involvement, distinguishing it from superficial lesions.

• Differentiate from superficial appendiceal endometriosis; this code specifies "deep."
• Always confirm laterality if applicable for other endometriosis codes, though not relevant for the appendix.
• Sequence as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it's a co-morbidity.