C84.A5
BillableCutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb
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 in the groin and lower leg areas.
Coding Tips
- •Inguinal lymph nodes are in the groin; lower limb includes femoral and popliteal nodes
- •Confirm groin or lower extremity lymph node involvement is documented
Clinical Significance
Cutaneous T-cell lymphoma, unspecified, involving inguinal and lower limb lymph nodes indicates skin-primary T-cell lymphoma with groin and lower extremity nodal progression. Inguinal nodes are commonly palpable and often enlarged in patients with lower extremity skin disease. As with other nodal sites, differentiating reactive dermatopathic adenopathy from lymphomatous involvement is essential for accurate staging.
Documentation Requirements
- ✓Skin biopsy confirming cutaneous T-cell lymphoma
- ✓Physical exam or imaging documenting inguinal/lower limb lymph node involvement
- ✓Node biopsy if needed to confirm lymphomatous vs. reactive involvement
- ✓TNMB staging incorporating inguinal nodal findings
- ✓Documentation of skin disease distribution
Commonly Confused Codes
C84.05 — Mycosis fungoides, inguinal/lower limb: If mycosis fungoides is specifically diagnosedC84.95 — Mature T/NK-cell lymphoma, unspecified, inguinal/lower limb: General T/NK lymphoma without cutaneous primaryC84.45 — PTCL-NOS, inguinal/lower limb: Primary nodal T-cell lymphomaC84.A6 — Cutaneous T-cell lymphoma, intrapelvic: Different anatomical region; deep pelvic vs. superficial inguinal
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.ACutaneous T-cell lymphoma, unspecified└C84.A5Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb
└C84.A5Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb