ICD-10-CM > N00-N99 > N80-N98 > N80 > N80.B N80.B Endometriosis of cardiothoracic space Non-Billable/Non-Specific Applicable To Endometriosis of thorax Code Also , if applicable:catamenial hemothorax (J94.2)catamenial pneumothorax (J93.12) Codes N80.B1Endometriosis of pleuraN80.B2Endometriosis of lungN80.B3Endometriosis of diaphragmN80.B31Superficial endometriosis of diaphragmN80.B32Deep endometriosis of diaphragmN80.B39Endometriosis of diaphragm, unspecified depthN80.B4Endometriosis of the pericardial spaceN80.B5Endometriosis of the mediastinal spaceN80.B6Endometriosis of cardiothoracic space