ICD-10-CM > C00-D49 > D10-D36 > D15 D15 Benign neoplasm of other and unspecified intrathoracic organs Non-Billable/Non-Specific Type 1 Excludes benign neoplasm of mesothelial tissue (D19.-) Codes D15.0Benign neoplasm of thymusD15.1Benign neoplasm of heartD15.2Benign neoplasm of mediastinumD15.7Benign neoplasm of other specified intrathoracic organsD15.9Benign neoplasm of intrathoracic organ, unspecified