C84.42
BillablePeripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes
HCC Category Mapping
V28HCC 19 — Lymphoma and Other Cancers
0.105V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 21 — Hodgkin Lymphoma and Other Cancers
0.000What This Code Means
A type of T-cell lymphoma affecting the lymph nodes inside the chest cavity.
Coding Tips
- •Verify documentation confirms intrathoracic (within the chest) lymph node involvement
- •This includes mediastinal and hilar lymph nodes
Clinical Significance
Peripheral T-cell lymphoma not elsewhere classified involving intrathoracic lymph nodes represents an aggressive non-Hodgkin lymphoma subtype with poor prognosis. Site-specific coding is critical because intrathoracic involvement may indicate mediastinal bulky disease, which affects staging and treatment approach. Accurate capture ensures appropriate resource allocation for this high-acuity malignancy.
Documentation Requirements
- ✓Pathology report confirming peripheral T-cell lymphoma, NOS (not a more specific T-cell lymphoma subtype)
- ✓Imaging (CT or PET/CT) documenting intrathoracic lymph node involvement (mediastinal, hilar, or paratracheal nodes)
- ✓Immunohistochemistry panel showing T-cell markers (CD3+, CD4+ or CD8+) and excluding other specific T-cell lymphoma subtypes
- ✓Current treatment status and clinical stage (Ann Arbor staging system)
- ✓Documentation that this is active disease, not in remission
Commonly Confused Codes
C84.62 — Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodes: ALCL is a specific subtype with distinct morphology (hallmark cells) and ALK expression; PTCL-NOS is a diagnosis of exclusion when no specific T-cell lymphoma subtype fitsC84.72 — Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodes: ALK-negative ALCL has specific morphologic features distinguishing it from PTCL-NOSC85.12 — Unspecified B-cell lymphoma, intrathoracic lymph nodes: B-cell lineage must be excluded through immunophenotyping before assigning a T-cell lymphoma codeC84.48 — PTCL-NOS, lymph nodes of multiple sites: Use C84.42 only when involvement is limited to intrathoracic nodes; if other regions are also involved, C84.48 is appropriate
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.4Peripheral T-cell lymphoma, not elsewhere classified└C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes
└C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes