Follicular lymphoma grade I, extrnod and solid organ sites

This code signifies a low-grade, indolent non-Hodgkin lymphoma originating from follicular B-cells, specifically when it is found in sites outside of the lymph nodes, such as the bone marrow, spleen, or other solid organs. It indicates a well-differentiated form of follicular lymphoma.

Apply this code when documentation clearly states a diagnosis of follicular lymphoma, grade I, and specifies involvement of extranodal sites or solid organs. This is appropriate for initial diagnosis, staging, and follow-up encounters where the extranodal involvement is confirmed.

• Ensure the pathology report explicitly states "grade I" for follicular lymphoma.
• Distinguish from nodal involvement; this code is specific to extranodal/solid organ sites.
• Do not use if the grade is unspecified or if it's a different histological subtype of lymphoma.