C84.Z5 Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb

ICD-10-CM Code C84.Z5: Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb

ICD-10-CM code C84.Z5 identifies a specific neoplastic process concerning other mature T/NK-cell lymphomas located in the lymph nodes of the inguinal region and lower limb. This active terminology record is nested under the parent category C84.Z and appears in federal billing guidelines for cellular transplantation. 1 5

Plain-language overview

Code C84.Z5 identifies a type of cancer called a neoplastic process, specifically targeting other mature T/NK-cell lymphomas situated within the lymph nodes of the inguinal region and lower limb. 1

What this code represents

The diagnosis code C84.Z5 represents an active terminology concept that falls under the broader parent category of C84.Z, which encompasses other mature T/NK-cell lymphomas. 1

Coding details

The official published abbreviation for code C84.Z5 is oth mature T/NK-cell lymph, nodes of ing rgn and lower limb, and the terminology record indicates it has narrower concepts. 1

Documentation considerations

The terminology record for C84.Z5 specifies the exact anatomical location of the lymph nodes of the inguinal region and lower limb, along with the neoplastic process classification. 1

Clinical context

Mature T-lymphocytes and natural killer cells are origins of cutaneous lymphomas, and systemic involvement of lymph nodes changes disease monitoring to standard protocols for mature T-cell neoplasms. 2

Coverage and utilization context

The code C84.Z5 appears within federal billing and coding guidelines that provide instructions for allogeneic hematopoietic cell transplantation for refractory or relapsed Hodgkin's and non-Hodgkin's lymphoma. 5 6

What the sources add

While the terminology authority defines the code's semantic type as a neoplastic process, federal billing articles establish its operational context within transplantation coverage guidelines for B-cell or T-cell origins. 1 5

A university research mapping system includes the exact C84.Z5 label among a list of various B-cell and T-cell lymphomas affecting the inguinal region and lower limb for phecode grouping. 3

Questions to verify

The supplied excerpts do not establish whether this code applies to initial encounters, subsequent encounters, or specific laterality requirements for the affected inguinal region and lower limb lymph nodes. 1

Sources

1. ICD-10-CM C84.Z5 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Primary cutaneous lymphomas: diagnosis and treatment — pmc.ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 202.2 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. Article - Billing and Coding: Allogeneic Hematopoietic Cell Transplantation for Primary Refractory or Relapsed Hodgkin's and Non-Hodgkin's Lymphoma with B-cell or T-cell Origin (A59259) — cms.gov; accessed 2026-07-27.
6. Article - Billing and Coding: Allogeneic Hematopoietic Cell Transplantation for Primary Refractory or Relapsed Hodgkin's and Non-Hodgkin's Lymphoma with B-cell or T-cell Origin (A59177) — cms.gov; accessed 2026-07-27.