ICD-10 Code E32.0 – Persistent hyperplasia of thymus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E32.0 – Persistent hyperplasia of thymus
What it is
E32.0 identifies persistent hyperplasia of the thymus, meaning the thymus remains enlarged beyond the expected age-related pattern. Use it when documentation specifically names this condition.
Clinical signs
Clinical features vary; refer to documentation. It may be noted on imaging or during evaluation for mediastinal enlargement, but the code is based on the documented diagnosis, not imaging alone.
When to use this code
Use E32.0 when the provider documents persistent hyperplasia of the thymus as the confirmed diagnosis. It is appropriate for encounters focused on evaluation, follow-up, or monitoring of this thymic condition. Check documentation if the record only says thymic enlargement or mediastinal mass.
Do not use for
Do not use this code for normal thymic tissue, nonspecific thymic enlargement, or other thymus disorders without the term persistent hyperplasia. Check documentation when the diagnosis is uncertain.
Coding tip
Code only when the provider clearly documents persistent hyperplasia of the thymus; imaging findings alone may not be enough.