Small cell B-cell lymphoma, nodes of head, face, and neck

This code signifies a specific type of non-Hodgkin lymphoma, small cell B-cell lymphoma, when it originates or is primarily located in the lymph nodes of the head, face, or neck region. This is a low-grade lymphoma characterized by small, mature-appearing B-lymphocytes.

Use this code when documentation clearly identifies a diagnosis of small cell B-cell lymphoma affecting the lymph nodes of the head, face, or neck. This diagnosis is typically confirmed by biopsy and histopathological examination of the affected lymph nodes.

• Ensure the documentation specifies "small cell B-cell lymphoma" and not another subtype of B-cell lymphoma.
• Verify the anatomical site is explicitly stated as lymph nodes of the head, face, or neck to differentiate from other nodal or extranodal sites.
• Consider sequencing this code with codes for any associated symptoms or complications, if applicable and supported by documentation.