Small cell B-cell lymphoma, intrapelvic lymph nodes

This code signifies a diagnosis of small cell B-cell lymphoma, a rare and aggressive type of non-Hodgkin lymphoma, specifically when it originates or is primarily located within the intrapelvic lymph nodes. This malignancy involves the uncontrolled proliferation of small, abnormal B-lymphocytes.

Use this code when documentation confirms a pathological diagnosis of small cell B-cell lymphoma with primary involvement or metastasis to lymph nodes located within the pelvic cavity. Supporting documentation includes pathology reports confirming the specific lymphoma subtype and imaging studies (e.g., CT, MRI, PET scans) or surgical reports detailing the intrapelvic lymph node involvement.

• Ensure the pathology report explicitly states "small cell B-cell lymphoma" to differentiate from other B-cell lymphoma subtypes.
• Verify the anatomical site of involvement is clearly documented as "intrapelvic lymph nodes" to avoid miscoding to other nodal sites.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by codes for any associated symptoms or complications.