ICD-10 Code C85.12 – Unspecified B-cell lymphoma, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.12 – Unspecified B-cell lymphoma, intrathoracic lymph nodes
What it is
C85.12 identifies a B-cell lymphoma involving intrathoracic lymph nodes when the specific lymphoma type is not documented. Use it for malignant lymphoid disease in chest lymph nodes, such as mediastinal or hilar nodes, when details are incomplete.
Clinical signs
Clinical features vary; refer to documentation. Patients may have imaging or biopsy evidence of lymphoma in intrathoracic nodes, with findings such as enlarged mediastinal nodes, cough, chest discomfort, or shortness of breath.
When to use this code
Use this code when the provider documents an unspecified B-cell lymphoma limited to intrathoracic lymph nodes and does not name a more specific subtype. It may also apply when pathology confirms B-cell lymphoma but the exact histology is still pending. If the record identifies a different nodal region or a more specific lymphoma, code that diagnosis instead.
Do not use for
Do not use this code for Hodgkin lymphoma, T-cell lymphomas, or lymphoma outside the intrathoracic nodes. Check documentation if the chart only says “lymphoma” without B-cell or location detail.
Coding tip
Code the site and lymphoma type exactly as documented; unspecified wording should not be upgraded to a more specific diagnosis.