Other diseases of thymus

This code represents various non-neoplastic and non-immunodeficiency-related conditions affecting the thymus gland that are not classified elsewhere. These are typically acquired or congenital anomalies of the thymus, excluding those specifically linked to immune system dysfunction or tumor formation.

Use this code for documented conditions such as thymic cysts, thymic hyperplasia (without immunodeficiency), or other specified but rare non-malignant thymic disorders. Documentation should clearly state a diagnosis related to the thymus that does not fall under aplasia/hypoplasia with immunodeficiency or thymoma.

• Ensure documentation explicitly rules out immunodeficiency when considering thymic hypoplasia or aplasia.
• Distinguish between benign thymic conditions and thymoma, which has a distinct code.
• Review pathology reports carefully for definitive diagnoses of thymic abnormalities.