ICD-10-CM · Chapter 2 · C00-D49
C37 Malignant neoplasm of thymus
Excludes 1 (cannot be coded together)
- malignant carcinoid tumor of the thymus (C7A.091)
This category is a complete, billable diagnosis code.
No additional specificity is required — submit C37 directly on claims and documentation without a subcode extension.
Last reviewed: September 2026