Follicular lymphoma grade I, unspecified site

This code identifies a specific type of non-Hodgkin lymphoma, follicular lymphoma, which is characterized by a slow-growing pattern and a follicular (nodular) growth pattern of malignant B-lymphocytes. Grade I indicates a low-grade malignancy, and "unspecified site" means the primary location of the lymphoma is not documented.

Use this code when the medical record clearly documents a diagnosis of follicular lymphoma, specifically identified as Grade I, but the anatomical site of the lymphoma is not specified. This is appropriate for initial diagnoses or follow-up encounters where the grade is known but the location remains undetermined or unrecorded.

• Ensure documentation explicitly states "follicular lymphoma" and "Grade I."
• Avoid using this code if a specific anatomical site (e.g., lymph nodes of head, neck, and trunk) is documented; instead, use the more specific C82.0- subcategories.
• If the grade is not specified, refer to C82.90 (Non-Hodgkin lymphoma, follicular, unspecified, unspecified site).