C84.A2
BillableCutaneous T-cell lymphoma, unspecified, 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 cancer of T cells that primarily affects the skin with involvement of lymph nodes inside the chest cavity.
Coding Tips
- •Intrathoracic lymph nodes include mediastinal and hilar nodes; confirm chest involvement is documented
- •This code indicates systemic spread beyond skin involvement
Clinical Significance
Cutaneous T-cell lymphoma, unspecified, involving intrathoracic lymph nodes indicates cutaneous lymphoma that has progressed to involve mediastinal or hilar nodes. Intrathoracic nodal involvement in a cutaneous T-cell lymphoma suggests significant systemic spread beyond typical skin-confined disease. This represents advanced staging and changes the treatment approach from skin-directed to systemic therapy.
Documentation Requirements
- ✓Original skin biopsy confirming cutaneous T-cell lymphoma
- ✓Chest imaging documenting intrathoracic lymph node involvement
- ✓Node biopsy or PET avidity confirming lymphomatous involvement
- ✓TNMB staging incorporating intrathoracic nodal findings
- ✓Treatment plan reflecting systemic disease
Commonly Confused Codes
C84.02 — Mycosis fungoides, intrathoracic lymph nodes: If mycosis fungoides is specifically diagnosedC84.92 — Mature T/NK-cell lymphoma, unspecified, intrathoracic: General T/NK lymphoma without cutaneous specificationC84.42 — PTCL-NOS, intrathoracic: Primary nodal T-cell lymphoma, not cutaneous primaryC84.A0 — Cutaneous T-cell lymphoma, unspecified site: Does not capture the intrathoracic node involvement
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.ACutaneous T-cell lymphoma, unspecified└C84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes
└C84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes