ICD-10 Code C84.45 – Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.45 – Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb
What it is
This code identifies peripheral T-cell lymphoma, not otherwise specified, when it involves lymph nodes in the inguinal region or lower limb. Use it for a documented T-cell lymphoma site in these nodal areas.
Clinical signs
Patients may present with enlarged inguinal lymph nodes, other nodal swelling in the lower limb region, or systemic lymphoma findings. Clinical features vary; refer to documentation.
When to use this code
Use C84.45 when the provider documents peripheral T-cell lymphoma, not elsewhere classified, with primary or involved lymph nodes in the inguinal region or lower limb. Code it from pathology, oncology, or discharge documentation that clearly supports both the lymphoma type and site.
If the record only says T-cell lymphoma without the “not elsewhere classified” wording or without nodal site detail, check documentation before assigning this code.
Do not use for
Do not use this code for other lymphoma subtypes, unspecified lymphoma, or disease limited to non-nodal tissues. Check documentation if the site is not clearly the inguinal region or lower limb.
Coding tip
Match the exact lymphoma wording and nodal location in the provider note before coding.