C84.Z2
BillableOther mature T/NK-cell lymphomas, intrathoracic lymph nodes
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 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 rare type of mature T-cell or NK-cell blood cancer affecting lymph nodes inside the chest cavity.
Coding Tips
- •Confirm documentation indicates involvement of mediastinal, hilar, or other intrathoracic lymph nodes
- •Differentiate from lung parenchymal involvement, which would be coded differently
Clinical Significance
Other mature T/NK-cell lymphoma involving intrathoracic lymph nodes represents a rare aggressive neoplasm requiring specific anatomical documentation. Accurate site coding to mediastinal, hilar, or paratracheal lymph node regions within the chest supports treatment planning and staging assessment. These lymphomas have variable prognosis depending on subtype, with some being highly aggressive and treatment-resistant.
Documentation Requirements
- ✓Pathology confirmation of mature T-cell or NK-cell lineage via immunophenotyping (CD3+, CD4/CD8, CD56 for NK-cell)
- ✓Imaging or clinical documentation confirming involvement of intrathoracic lymph nodes
- ✓Specific subtype identification when possible (angioimmunoblastic, hepatosplenic, extranodal NK/T-cell, etc.)
- ✓Ann Arbor staging and whether B-symptoms (fever, night sweats, weight loss) are present
Commonly Confused Codes
C84.A series (Cutaneous T-cell lymphoma) — C84.Z is for non-cutaneous mature T/NK-cell subtypes; verify the lymphoma is NOT a cutaneous subtypeC84.4x (Peripheral T-cell lymphoma, not elsewhere classified) — C84.4 is specifically for PTCL-NOS; C84.Z covers other named subtypes not classified elsewhereC86.x (Other specified T/NK-cell lymphomas) — Check C86 codes first for hepatosplenic (C86.1), enteropathy-associated (C86.2), or subcutaneous panniculitis-like (C86.3) subtypes
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.ZOther mature T/NK-cell lymphomas└C84.Z2Other mature T/NK-cell lymphomas, intrathoracic lymph nodes
└C84.Z2Other mature T/NK-cell lymphomas, intrathoracic lymph nodes