Deep endometriosis of diaphragm

This code signifies the presence of endometrial tissue deeply infiltrating the diaphragm. This condition is a form of extrapelvic endometriosis, where the endometrial-like tissue grows outside the uterus, specifically affecting the muscular and fibrous partition separating the thoracic and abdominal cavities. Patients may experience symptoms such as catamenial chest pain, dyspnea, or shoulder pain.

Apply this code when documentation explicitly states deep endometriosis involving the diaphragm. This diagnosis is typically confirmed through imaging studies (e.g., MRI, CT) or surgical visualization and biopsy. Use this code to specify the exact anatomical location of deep endometriosis when the diaphragm is affected.

• Ensure documentation specifies "deep" involvement of the diaphragm, not just superficial implants.
• Do not confuse with endometriosis of the pleura (N80.B4) or other thoracic sites.
• Code any associated complications or symptoms, such as pneumothorax (J93.-) or hemothorax (J94.2), as additional diagnoses.