Follicular lymphoma grade IIIb, intrapelvic lymph nodes

This code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, which is characterized by a grade IIIb cellular architecture. The "b" subclassification indicates a higher proportion of centroblasts, suggesting a more aggressive disease course. This particular code specifies the involvement of lymph nodes located within the pelvis.

Use this code when documentation confirms a pathological diagnosis of follicular lymphoma, specifically graded as IIIb, and imaging or biopsy reports indicate involvement of intrapelvic lymph nodes. This code is appropriate for initial diagnosis, staging, and follow-up encounters where the intrapelvic involvement is still relevant.

• Ensure the pathology report explicitly states "follicular lymphoma grade IIIb" and not just "follicular lymphoma."
• Verify the anatomical site of involvement is clearly documented as "intrapelvic lymph nodes" to differentiate from other nodal sites.
• Do not confuse grade IIIb with grade IIIa; the "b" indicates a more aggressive variant.