Benign neoplasm of other and unspecified intrathoracic organs (D15) ICD-10-CM
The D15 code range covers benign neoplasm of other and unspecified intrathoracic organs with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- benign neoplasm of mesothelial tissue D19
Codes in the D15 Range 6 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the D15 range.
Endocardium
The innermost layer of the heart, comprised of endothelial cells.
Ganglioneuroma
A benign neoplasm that usually arises from the sympathetic trunk in the mediastinum. Histologic features include spindle cell proliferation (resembling a neurofibroma) and the presence of large ganglion cells. The tumor may present clinically with HORNER SYNDROME or diarrhea due to ectopic production of vasoactive intestinal peptide. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, p966)
Horner Syndrome
A syndrome associated with defective sympathetic innervation to one side of the face, including the eye. Clinical features include MIOSIS; mild BLEPHAROPTOSIS; and hemifacial ANHIDROSIS (decreased sweating)(see HYPOHIDROSIS). Lesions of the BRAIN STEM; cervical SPINAL CORD; first thoracic nerve root; apex of the LUNG; CAROTID ARTERY; CAVERNOUS SINUS; and apex of the ORBIT may cause this condition. (From Miller et al., Clinical Neuro-Ophthalmology, 4th ed, pp500-11)
Myocardial Stunning
Prolonged dysfunction of the myocardium after a brief episode of severe ischemia, with gradual return of contractile activity.
Myocardium
The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow.
Pericardial Fluid
Watery fluid produced in the serous and visceral pericardium surrounding the surface of the HEART.
Pericardium
A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.
Rhabdomyoma
A benign tumor derived from striated muscle. It is extremely rare, generally occurring in the tongue, neck muscles, larynx, uvula, nasal cavity, axilla, vulva, and heart. These tumors are treated by simple excision. (Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1354)
Thymoma
A neoplasm originating from thymic tissue, usually benign, and frequently encapsulated. Although it is occasionally invasive, metastases are extremely rare. It consists of any type of thymic epithelial cell as well as lymphocytes that are usually abundant. Malignant lymphomas that involve the thymus, e.g., lymphosarcoma, Hodgkin's disease (previously termed granulomatous thymoma), should not be regarded as thymoma. (From Stedman, 25th ed)
About the D15 Code Range
The ICD-10 code D15 and its subcodes classify benign tumors located in the intrathoracic organs, which include the thymus, heart, and mediastinum. These codes help specify noncancerous growths within various chest structures.
Specifically, D15.0 identifies benign thymus tumors, sometimes referred to as thymoma or associated with conditions like myasthenia gravis. The D15.1 code covers benign heart tumors such as atrial myxoma, rhabdomyoma, and other neoplasms affecting the endocardium, myocardium, or epicardium. For tumors in the mediastinum, including ganglioneuromas or mediastinal teratomas, D15.2 is used. The D15.7 code applies to benign neoplasms in other specified intrathoracic organs not otherwise classified. When the exact organ or tumor type within the chest is unclear, D15.9 refers to unspecified benign intrathoracic tumors. Understanding these distinctions ensures accurate coding for benign intrathoracic neoplasms, supporting proper diagnosis documentation and care planning.
Questions About This Page
How many billable codes are in the D15 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the D15 range classify?
The range classifies benign neoplasm of other and unspecified intrathoracic organs. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
