ICD-10 Code C83.12 – Mantle cell lymphoma, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.12 – Mantle cell lymphoma, intrathoracic lymph nodes
What it is
This code identifies mantle cell lymphoma involving intrathoracic lymph nodes, such as mediastinal or hilar nodes. It is a malignant B-cell non-Hodgkin lymphoma documented in the chest lymphatic region.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lymphoma include enlarged lymph nodes, chest-related mass effect, or imaging evidence of intrathoracic nodal disease.
When to use this code
Use this code when the provider documents mantle cell lymphoma with primary or specified involvement of intrathoracic lymph nodes. Apply it when pathology, imaging, or the assessment clearly links the lymphoma to chest lymph nodes. Check documentation if the site is not specified.
Do not use for
Do not use this code for mantle cell lymphoma limited to other nodal regions or for unspecified lymphoma site. If the record only says lymphoma without anatomic detail, code the documented unspecified category instead.
Coding tip
Confirm that the intrathoracic location is explicitly stated in the final diagnosis or assessment before assigning C83.12.