ICD-10 Code C85.2A – Mediastinal (thymic) large B-cell lymphoma, in remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.2A – Mediastinal (thymic) large B-cell lymphoma, in remission
What it is
This code identifies a history of mediastinal (thymic) large B-cell lymphoma that is currently in remission. Use it when the patient still has the diagnosis, but there is no active disease documented.
Clinical signs
Clinical features vary; refer to documentation. Earlier disease typically presents as a mediastinal mass, which may cause cough, chest discomfort, shortness of breath, or superior vena cava syndrome.
When to use this code
Use this code when the provider documents mediastinal (thymic) large B-cell lymphoma as “in remission,” “in complete remission,” or similar wording. It may also apply at follow-up visits when the malignancy remains part of the active problem list, but no current treatment for active disease is described.
Do not use for
Do not use this code for active lymphoma, suspected lymphoma, or a personal history of lymphoma without remission status. Check documentation if the record does not clearly state remission.
Coding tip
Confirm the exact lymphoma type and remission wording in the provider note before assigning this code.