ICD-10-CM > C00-D49 > C45-C49 > C49 > C49.3 C49.3 Malignant neoplasm of connective and soft tissue of thorax Billable/Specific Copy Code Copy Description Applicable To Malignant neoplasm of axillaMalignant neoplasm of diaphragmMalignant neoplasm of great vessels Type 1 Excludes malignant neoplasm of breast (C50.-)malignant neoplasm of heart (C38.0)malignant neoplasm of mediastinum (C38.1-C38.3)malignant neoplasm of thymus (C37)