Non-follic (diffuse) lymphoma, unsp, intrathorac lymph nodes

This code signifies a malignant proliferation of lymphocytes that is not of follicular origin, affecting the lymph nodes within the chest cavity. It indicates a diffuse growth pattern of lymphoma where the specific type of non-follicular lymphoma has not been further identified. This diagnosis points to an aggressive form of lymphoma impacting the mediastinal, hilar, or other intrathoracic lymph node groups.

Apply this code when documentation confirms a diagnosis of non-follicular lymphoma with involvement of intrathoracic lymph nodes, and the specific subtype of non-follicular lymphoma (e.g., diffuse large B-cell lymphoma) is not yet determined or specified. This is typically used for initial diagnoses or when pathology reports indicate "non-follicular lymphoma, NOS" or "diffuse lymphoma, NOS" with intrathoracic involvement.

• Do not use this code if a more specific type of non-follicular lymphoma (e.g., C83.3- for diffuse large B-cell lymphoma) is documented.
• Ensure documentation clearly specifies "intrathoracic lymph nodes" as the primary site of involvement.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter or treatment.