Follicular lymphoma, unsp, nodes of head, face, and neck

This code signifies a diagnosis of follicular lymphoma, a type of non-Hodgkin lymphoma, when the specific subtype or grade is not documented. The primary site of involvement is limited to the lymph nodes located in the head, face, or neck regions. This diagnosis indicates a malignant proliferation of follicular center B-lymphocytes.

Use this code when the medical record confirms a diagnosis of follicular lymphoma, but the pathologist's report or physician documentation does not specify the grade (e.g., grade 1, 2, 3, or diffuse large B-cell lymphoma component). It is specifically for cases where the disease is confined to the lymph nodes of the head, face, or neck. Documentation should clearly state "follicular lymphoma" and identify the affected lymph node regions.

• Ensure documentation explicitly states "follicular lymphoma" and specifies involvement of head, face, or neck lymph nodes.
• Avoid using this code if a specific grade of follicular lymphoma (e.g., C82.01-C82.31) is documented, as more specific codes exist.
• If the lymphoma involves sites other than the head, face, or neck lymph nodes, a different C82 subcategory or additional codes may be necessary.