Unspecified B-cell lymphoma, intra-abdominal lymph nodes

This diagnosis code signifies a malignant proliferation of B-lymphocytes, specifically within the lymph nodes located inside the abdominal cavity, where the precise subtype of B-cell lymphoma has not been determined. It indicates a primary cancer originating from the lymphatic system affecting internal abdominal lymph nodes.

Assign this code when documentation confirms a diagnosis of B-cell lymphoma affecting intra-abdominal lymph nodes, but the specific B-cell subtype (e.g., diffuse large B-cell, follicular) is not yet identified or specified by the clinician. This is often used for initial diagnoses pending further pathology results or when the subtype remains unknown.

• Ensure the documentation explicitly states "unspecified B-cell lymphoma" or "B-cell lymphoma, type unspecified" and specifies involvement of "intra-abdominal lymph nodes."
• Avoid using this code if a more specific B-cell lymphoma subtype (e.g., C83.33 for diffuse large B-cell lymphoma of intra-abdominal lymph nodes) is documented.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, followed by any associated symptoms or complications.