Follicular lymphoma grade IIIa, intrapelvic lymph nodes

This code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, which has progressed to grade IIIa, indicating a higher degree of cellular atypia and mitotic activity. The disease is specifically located within the intrapelvic lymph nodes, meaning the cancerous cells are found in the lymph nodes situated within the pelvic region.

This code is appropriate for patients diagnosed with follicular lymphoma confirmed by biopsy to be grade IIIa, with imaging or pathological evidence of involvement of lymph nodes within the pelvis. Documentation should clearly state the histological grade of the follicular lymphoma and the anatomical site of involvement.

• Ensure the pathology report explicitly states "follicular lymphoma grade IIIa" and identifies intrapelvic lymph node involvement.
• Do not confuse grade IIIa with grade IIIb; these are distinct histological classifications with different code assignments.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless another condition is the primary focus of treatment.