Mediastnl large B-cell lymph, nodes of axilla and upper limb

This code identifies a specific type of non-Hodgkin lymphoma, mediastinal (thymic) large B-cell lymphoma, when it is located in the lymph nodes of the axilla and/or upper limb. This aggressive B-cell lymphoma typically originates in the mediastinum but has metastasized or is present in these peripheral lymph node regions.

Use this code when documentation confirms a diagnosis of mediastinal (thymic) large B-cell lymphoma with involvement specifically noted in the axillary or upper limb lymph nodes. This diagnosis is typically established through biopsy and histopathological examination.

• Ensure the documentation clearly specifies "mediastinal (thymic)" large B-cell lymphoma, as other large B-cell lymphoma types have different codes.
• Verify the anatomical site of involvement is explicitly stated as axillary or upper limb lymph nodes.
• Do not confuse with other large B-cell lymphomas or lymphomas affecting different anatomical sites.