Peripheral T-cell lymphoma, NEC, lymph nodes mult site

This code signifies a diagnosis of Peripheral T-cell lymphoma (PTCL) that does not fit into other specific PTCL subtypes, affecting lymph nodes in multiple anatomical regions. It represents a group of aggressive non-Hodgkin lymphomas originating from mature T-cells, characterized by widespread lymphatic involvement.

Apply this code when documentation specifies a diagnosis of "Peripheral T-cell lymphoma, not otherwise specified" or "PTCL, NOS," with clear evidence of involvement in lymph nodes across multiple sites (e.g., cervical, axillary, inguinal). This code is appropriate when a more specific PTCL subtype cannot be identified from the pathology report or clinical notes.

• Ensure the pathology report explicitly states "Peripheral T-cell lymphoma, not elsewhere classified" or "PTCL, NOS."
• Verify documentation confirms involvement of lymph nodes in more than one distinct anatomical region to support "multiple sites."
• Do not use this code if a more specific subtype of PTCL (e.g., anaplastic large cell lymphoma, angioimmunoblastic T-cell lymphoma) is identified.