Foliclar lymphoma grade IIIb, nodes of axilla and upper limb

This code signifies a diagnosis of follicular lymphoma, specifically grade IIIb, which is a more aggressive subtype of this non-Hodgkin lymphoma. The disease is localized to the lymph nodes within the axilla and/or upper limb. This grade indicates a higher proliferation rate and often requires more intensive treatment.

Apply this code when documentation confirms a pathological diagnosis of follicular lymphoma, grade IIIb, with specific involvement of lymph nodes in the axillary region or upper extremity. This diagnosis is typically established via biopsy and immunohistochemical staining, with the grade determined by the number of centroblasts per high-power field.

• Ensure the pathology report explicitly states "grade IIIb" for follicular lymphoma.
• Verify the anatomical site of involvement is clearly documented as axillary or upper limb lymph nodes.
• Do not use this code for other grades of follicular lymphoma or for follicular lymphoma affecting other body sites.