C84.43

Billable

Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes

HCC Category Mapping

V28HCC 19 — Lymphoma and Other Cancers

0.105

V24HCC 10 — Lymphoma and Other Cancers

0.675

ESRDHCC 10 — Lymphoma and Other Cancers

0.000

RxHCCHCC 21 — Hodgkin Lymphoma and Other Cancers

0.000

What This Code Means

A type of T-cell lymphoma affecting the lymph nodes in the abdominal cavity.

Coding Tips

•Confirm documentation specifies intra-abdominal lymph node involvement
•This includes mesenteric, retroperitoneal, and other abdominal lymph nodes

Clinical Significance

Peripheral T-cell lymphoma not elsewhere classified involving intra-abdominal lymph nodes indicates aggressive lymphoma with abdominal disease burden. Intra-abdominal involvement may include mesenteric, retroperitoneal, and para-aortic nodes, which can cause significant morbidity including bowel obstruction and ureteral compression. Precise site coding supports treatment planning and resource prediction.

Documentation Requirements

✓Pathology confirming peripheral T-cell lymphoma NOS by exclusion of specific subtypes
✓Imaging (CT, PET/CT, or MRI) documenting intra-abdominal lymph node involvement with specific node groups identified
✓Immunophenotyping results confirming T-cell lineage
✓Clinical staging documentation (Ann Arbor system)
✓Active disease status confirmed — not in remission

Commonly Confused Codes

C84.46 — PTCL-NOS, intrapelvic lymph nodes: Pelvic nodes (iliac, obturator) are distinct from abdominal nodes (mesenteric, retroperitoneal); use imaging to differentiate the anatomical boundary C84.47 — PTCL-NOS, spleen: Splenic involvement is coded separately from intra-abdominal lymph nodes even though both are in the abdomen C84.63 — Anaplastic large cell lymphoma, ALK-positive, intra-abdominal: Requires confirmed ALK-positive status on pathology; do not interchange with PTCL-NOS C86.2 — Enteropathy-associated T-cell lymphoma: A specific subtype arising in the GI tract associated with celiac disease; not the same as PTCL-NOS with abdominal node involvement

Code Hierarchy

└C84Mature T/NK-cell lymphomas └C84.4Peripheral T-cell lymphoma, not elsewhere classified └C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes

└C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes