ICD-10 Code E32.9 – Disease of thymus, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E32.9 – Disease of thymus, unspecified
What it is
E32.9 identifies a thymus disorder when the record does not specify the exact type. Use it for thymic disease that is documented, but not further described.
Clinical signs
Clinical features vary; refer to documentation. Thymus disorders may be found on imaging, pathology, or specialist evaluation, and may be associated with mediastinal findings or immune-related concerns.
When to use this code
Use this code when the clinician documents a disease of the thymus but does not name a more specific condition. It is appropriate when the chart only says thymic disorder, thymus disease, or similar nonspecific wording.
If later records identify a specific thymic diagnosis, code that more precise condition instead. Check documentation when the note is vague, incomplete, or conflicting.
Do not use for
Do not use E32.9 when the provider names a specific thymus disorder, such as thymic hyperplasia, aplasia, or other defined disease. Do not assign it for incidental thymic findings without documented disease.
Coding tip
Query the provider when the thymus condition is unclear, because E32.9 is a nonspecific fallback code.