Unspecified B-cell lymphoma, intrathoracic lymph nodes

This code signifies a malignant neoplasm originating from B-lymphocytes, specifically when the exact subtype of B-cell lymphoma is not determined, and the primary site of involvement is within the intrathoracic lymph nodes. This includes lymph nodes located in the mediastinum, hila of the lungs, and other areas within the chest cavity.

Use this code when the pathology report confirms a B-cell lymphoma, but further subtyping (e.g., diffuse large B-cell, follicular, mantle cell) is not specified or available at the time of coding. It is applicable when imaging studies or biopsy results indicate the intrathoracic lymph nodes as the primary or sole site of involvement. Documentation should clearly state "unspecified B-cell lymphoma" and "intrathoracic lymph nodes."

• Avoid using this code if a more specific B-cell lymphoma subtype (e.g., C83.3- for diffuse large B-cell lymphoma) is documented.
• Ensure the documentation explicitly states "intrathoracic lymph nodes" to support the anatomical specificity of this code.
• If the lymphoma is disseminated or involves multiple sites, consider additional codes to capture the full extent of the disease, following sequencing guidelines.