Peripheral T-cell lymphoma, NEC, intrathoracic lymph nodes

This code signifies a rare and aggressive type of non-Hodgkin lymphoma originating from mature T-cells, specifically when the primary site of involvement is within the lymph nodes located inside the chest cavity. It represents a diagnosis of exclusion, meaning other specific types of T-cell lymphomas have been ruled out.

Apply this code when documentation confirms a diagnosis of peripheral T-cell lymphoma that does not fit into other specified categories, and imaging or biopsy reports clearly indicate involvement of intrathoracic lymph nodes. This diagnosis is typically established through histopathological examination of biopsied lymph node tissue, often with immunohistochemical staining.

• Ensure the pathology report explicitly states "peripheral T-cell lymphoma, not otherwise specified" or similar terminology, and confirms intrathoracic lymph node involvement.
• Differentiate from other specific T-cell lymphomas (e.g., anaplastic large cell lymphoma) which have their own distinct codes.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter or hospitalization.