Mantle cell lymphoma, intrapelvic lymph nodes

This code signifies a malignant lymphoma of the B-cell type, specifically mantle cell lymphoma, located within the lymph nodes of the pelvic region. It is characterized by the uncontrolled proliferation of small to medium-sized lymphocytes that typically express CD5 and CD20.

Apply this code when documentation clearly states a diagnosis of mantle cell lymphoma affecting lymph nodes situated within the pelvis. This includes findings from biopsy, imaging (e.g., CT, MRI), or pathology reports confirming the specific histological subtype and anatomical location.

• Ensure the documentation specifies "mantle cell" lymphoma, as other B-cell lymphomas have different codes.
• Verify the anatomical site is explicitly "intrapelvic lymph nodes" to differentiate from other nodal or extranodal sites.
• Do not use this code if the lymphoma is described as diffuse large B-cell lymphoma or follicular lymphoma, even if located in the pelvis.