C84.Z9
BillableOther mature T/NK-cell lymphomas, extranodal and solid organ sites
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 type of cancer affecting T-cells or NK-cells that has spread to organs outside the lymph node system, such as the liver, lungs, or other solid organs.
Coding Tips
- •This code indicates extranodal involvement; document which specific organs are affected for clinical clarity
- •Use when disease extends beyond lymph nodes to solid organs or tissues
Clinical Significance
Other mature T/NK-cell lymphoma with extranodal and solid organ involvement represents advanced disease with significant organ damage and poor prognosis. Extranodal NK/T-cell lymphoma frequently involves the nasal cavity, skin, and gastrointestinal tract and requires aggressive treatment. Accurate extranodal site documentation is essential for treatment planning and outcomes tracking.
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 extranodal and solid organ sites
- ✓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.Z9Other mature T/NK-cell lymphomas, extranodal and solid organ sites
└C84.Z9Other mature T/NK-cell lymphomas, extranodal and solid organ sites