ICD-10 Code C84.43 – Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.43 – Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes
What it is
This code identifies peripheral T-cell lymphoma, not otherwise specified, involving intra-abdominal lymph nodes. It is used when the lymphoma is documented in abdominal nodal tissue and does not fit a more specific T-cell lymphoma subtype.
Clinical signs
Findings may include enlarged intra-abdominal lymph nodes, abdominal pain, weight loss, fever, or night sweats. Clinical features vary; refer to documentation and pathology results for the confirmed lymphoma type and site.
When to use this code
Use this code when the provider documents peripheral T-cell lymphoma, not elsewhere classified, with a primary or involved site in intra-abdominal lymph nodes. It is appropriate when imaging, biopsy, or pathology supports nodal disease in the abdomen. Code from the documented diagnosis, not from symptoms alone.
Do not use for
Do not use this code for other specified T-cell lymphomas, extranodal disease, or lymphoma sites outside the intra-abdominal lymph nodes. Check documentation if the record only states “lymphoma” without the required subtype and site.
Coding tip
Verify both the exact lymphoma subtype and the anatomic site before assigning C84.43.