Follicular lymphoma grade IIIa, lymph nodes mult site

This diagnosis code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, that has reached grade IIIa. This grade indicates a higher proportion of centroblasts (large atypical lymphocytes) within the tumor. The "multiple sites" aspect specifies that the lymphoma is present in lymph nodes in more than one anatomical region.

Use this code when documentation clearly states a diagnosis of follicular lymphoma, specifically graded as IIIa, and confirms involvement of lymph nodes in multiple, non-contiguous sites. This diagnosis is typically established through biopsy and histopathological examination, often with immunohistochemical staining.

• Ensure the pathology report explicitly states "follicular lymphoma grade IIIa" and confirms multi-site lymph node involvement.
• Do not use this code if the grade is unspecified or if only a single lymph node region is documented as involved.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated signs, symptoms, or complications.