C84.05
BillableMycosis fungoides, 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 19 — Lymphoma and Other Cancers
0.000What This Code Means
A rare type of skin cancer (mycosis fungoides) that has spread to the lymph nodes in the groin and lower leg areas.
Coding Tips
- •Verify inguinal and lower limb lymph node involvement through physical examination or imaging
- •The '5' designator indicates inguinal region and lower extremity lymph node sites
Clinical Significance
Mycosis fungoides involving inguinal and lower limb lymph nodes indicates disease that has spread beyond the skin to the lymph nodes in the groin and lower extremities. This advancement in staging requires evaluation for systemic therapy and carries prognostic significance. Inguinal nodes are commonly involved in mycosis fungoides patients with lower extremity skin disease.
Documentation Requirements
- ✓Skin biopsy confirming mycosis fungoides
- ✓Inguinal lymph node biopsy or imaging confirming involvement
- ✓Distinction between reactive and lymphomatous nodal involvement
- ✓TNMB staging reflecting nodal disease
- ✓Treatment plan for advanced-stage disease
Commonly Confused Codes
C84.06 — Mycosis fungoides, intrapelvic lymph nodes: Intrapelvic nodes are deep within the pelvis; inguinal nodes are in the groin — distinct anatomic locationsC84.00 — Mycosis fungoides, unspecified site: Use C84.05 when inguinal/lower limb involvement is confirmedC77.4 — Secondary malignant neoplasm, inguinal: Do not use for primary lymphoma
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.0Mycosis fungoides└C84.05Mycosis fungoides, lymph nodes of inguinal region and lower limb
└C84.05Mycosis fungoides, lymph nodes of inguinal region and lower limb