Diffuse follicle center lymphoma, intrapelvic lymph nodes

This code signifies a specific type of non-Hodgkin lymphoma, diffuse follicle center lymphoma, when it originates or is primarily located within the intrapelvic lymph nodes. This aggressive B-cell lymphoma is characterized by a diffuse growth pattern and features of follicle center cells.

Use this code for patients diagnosed with diffuse follicle center lymphoma where imaging (e.g., CT, MRI, PET scan) or biopsy confirms involvement of lymph nodes within the pelvic cavity. Documentation should clearly specify the histological subtype as "diffuse follicle center lymphoma" and the anatomical site as "intrapelvic lymph nodes."

• Ensure the pathology report explicitly states "diffuse follicle center lymphoma" to differentiate from other follicular lymphoma subtypes.
• Verify that the documentation specifies "intrapelvic lymph nodes" as the primary or involved site; do not use for generalized or extranodal involvement.
• Consider sequencing this code with codes for any associated symptoms or complications, such as lymphadenopathy (R59.-) if documented separately and not inherent to the diagnosis.