Mantle cell lymphoma, unspecified site

This code signifies a diagnosis of mantle cell lymphoma (MCL), a rare and aggressive type of non-Hodgkin lymphoma. MCL is characterized by the uncontrolled proliferation of B-lymphocytes within the mantle zone of lymphoid follicles. The "unspecified site" indicates that the primary location of the lymphoma has not been documented or determined.

Utilize this code when documentation confirms a diagnosis of mantle cell lymphoma, but the specific anatomical site of involvement is not specified by the provider. This is often an interim diagnosis or used when the extent of the disease is still being evaluated. Support for this code includes pathology reports confirming MCL without site specificity, or physician notes indicating MCL without further localization.

• Avoid using this code if a specific anatomical site of mantle cell lymphoma is documented; instead, use the more precise site-specific codes within the C83.1 subcategory.
• Query the provider if the documentation indicates MCL but lacks site specificity, to determine if a more precise code can be assigned.
• This code should be sequenced as the primary diagnosis when it is the reason for the encounter or hospitalization.