ICD-10 Code D15.9 – Benign neoplasm of intrathoracic organ, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D15.9 – Benign neoplasm of intrathoracic organ, unspecified
What it is
D15.9 identifies a noncancerous tumor in an intrathoracic organ when the exact organ is not documented. It is used for benign growths within the chest, such as mediastinal or other thoracic structures, when site detail is missing.
Clinical signs
Clinical features vary; refer to documentation. Patients may have no symptoms, or they may present with chest discomfort, cough, shortness of breath, or findings from imaging that show a benign-appearing thoracic mass.
When to use this code
Use this code when the record clearly states a benign neoplasm in an intrathoracic organ but does not name the specific organ. It also fits when pathology or imaging supports a benign thoracic mass and the provider documents the site only as intrathoracic. If the organ is identified, code to the more specific option instead.
Do not use for
Do not use D15.9 for malignant tumors, metastatic disease, or non-neoplastic thoracic masses. Also avoid it when the documentation names a specific intrathoracic site that has a more precise code.
Coding tip
Check the operative note, pathology report, or imaging impression for the exact thoracic site before assigning the unspecified code.