Unspecified B-cell lymphoma, lymph nodes of multiple sites

This code represents a malignant neoplasm originating from B-lymphocytes, where the specific subtype of B-cell lymphoma is not further identified. The disease involves multiple lymph node regions throughout the body, indicating widespread lymphatic involvement.

Use this code when the medical record clearly states a diagnosis of B-cell lymphoma affecting multiple lymph node sites, but the pathologist or clinician has not specified a more definitive subtype (e.g., diffuse large B-cell lymphoma, follicular lymphoma). This code is appropriate when documentation indicates "unspecified B-cell lymphoma" with multifocal lymph node involvement.

• Avoid using this code if a more specific B-cell lymphoma subtype is documented; always code to the highest level of specificity.
• Ensure documentation explicitly states "multiple sites" or similar phrasing to support the "multiple sites" specificity.
• Review pathology reports carefully for definitive B-cell lymphoma subtypes before defaulting to "unspecified."