Foliclar lymphoma grade IIIa, nodes of head, face, and neck

This code signifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, which is characterized by a grade IIIa cellular architecture. The malignancy is localized to the lymph nodes situated in the head, face, and neck regions. This grade indicates a more aggressive form of follicular lymphoma compared to grades I or II.

This code is appropriate for patients diagnosed with follicular lymphoma, specifically when biopsy results confirm a grade IIIa classification. Documentation must clearly indicate involvement of lymph nodes within the head, face, or neck. Use this code when the physician's diagnosis explicitly states "follicular lymphoma grade IIIa" and specifies the anatomical location.

• Ensure the pathology report explicitly states "grade IIIa" for follicular lymphoma; do not assume the grade.
• Verify that the documentation clearly identifies lymph node involvement in the head, face, or neck; avoid coding based on generalized "lymphoma."
• Sequence this code as the primary diagnosis when it is the reason for the encounter or treatment.