Follicular lymphoma grade IIIa, unspecified site

This code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, that is classified as grade IIIa. This grade indicates a more aggressive form of follicular lymphoma with a higher proportion of large cells, but the primary site of the lymphoma is not documented.

Apply this code when the pathology report confirms follicular lymphoma, grade IIIa, but the medical record does not specify the anatomical location of the tumor. This is typically used when the diagnosis is established from a biopsy without further localization or when the primary site is unknown or unstated.

• Ensure the pathology report explicitly states "follicular lymphoma grade IIIa."
• Do not use this code if a specific anatomical site for the follicular lymphoma is documented; instead, use a more specific code from the C82.3- subcategory.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter or treatment.