Follicular lymphoma grade IIIb, intra-abdominal lymph nodes

This code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, that has reached an aggressive grade (IIIb). The disease is located within the lymph nodes found inside the abdominal cavity. This grade indicates a higher proliferation rate and often requires more intensive treatment.

Use this code when documentation explicitly states a diagnosis of follicular lymphoma, specifically identified as grade IIIb, and the primary site of involvement is confirmed to be intra-abdominal lymph nodes. Supporting documentation must include pathology reports confirming the grade and imaging or surgical reports confirming the intra-abdominal location.

• Ensure the pathology report specifies "grade IIIb" and not just "grade III" or "high-grade follicular lymphoma."
• Verify the anatomical site is clearly documented as "intra-abdominal lymph nodes" to differentiate from other nodal sites.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless a more specific complication or manifestation is being treated.