Follicular lymphoma grade I, nodes of axilla and upper limb

This code signifies a low-grade follicular lymphoma, a slow-growing type of non-Hodgkin lymphoma, specifically located in the lymph nodes of the axilla and/or upper limb. It indicates the earliest and least aggressive form of this malignancy, characterized by a follicular growth pattern.

Use this code when diagnostic pathology reports confirm follicular lymphoma, Grade 1, and imaging or physical examination clearly identifies involvement of axillary or upper limb lymph nodes. Documentation should specify the grade of the lymphoma and the precise anatomical location of the affected lymph nodes.

• Ensure the pathology report explicitly states "Grade I" for follicular lymphoma; otherwise, a different grade-specific code may be necessary.
• Verify the anatomical site of involvement is limited to the axilla and/or upper limb; involvement of other sites requires additional or alternative codes.
• Always sequence this code as the primary diagnosis when the lymphoma is the reason for the encounter, unless treatment for a complication is the focus.