Follicular lymphoma grade I, nodes of head, face, and neck

This code signifies a diagnosis of follicular lymphoma, specifically a low-grade (Grade I) type, when the disease is localized to the lymph nodes found in the head, face, and neck regions. Follicular lymphoma is a slow-growing non-Hodgkin lymphoma originating from B-lymphocytes.

Use this code when documentation clearly states a diagnosis of follicular lymphoma, histologically confirmed as Grade I, and imaging or pathology reports specify involvement of lymph nodes in the head, face, or neck. This code is appropriate for initial diagnosis, treatment planning, and follow-up encounters where this specific site and grade are confirmed.

• Ensure the pathology report explicitly states "Grade I" for follicular lymphoma.
• Verify the anatomical location of the involved lymph nodes is limited to the head, face, or neck.
• Do not use this code if the lymphoma is described as diffuse, high-grade, or involves other body regions.