Follicular lymphoma grade I, lymph nodes of multiple sites

This diagnosis code signifies a slow-growing type of non-Hodgkin lymphoma originating from B-lymphocytes, specifically follicular lymphoma, that has been histologically graded as Grade I. The disease is disseminated, affecting multiple lymph node regions throughout the body.

Apply this code when documentation confirms a pathological diagnosis of follicular lymphoma, explicitly graded as Grade I, and imaging or biopsy reports indicate involvement of lymph nodes in more than one distinct anatomical site (e.g., cervical and inguinal). This code is appropriate for initial diagnosis and subsequent encounters where the grade and multi-site involvement remain relevant.

• Ensure the pathology report explicitly states "follicular lymphoma, Grade I." Do not assume the grade if not documented.
• Verify documentation of involvement in "multiple sites" of lymph nodes; localized disease or involvement of a single site would necessitate a different code.
• This code is for the primary diagnosis of the malignancy; additional codes may be needed for associated symptoms or complications.