ICD-10 Code C84.49 – Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.49 – Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites
What it is
This code identifies peripheral T-cell lymphoma, not otherwise specified, when it arises in extranodal or solid organ sites. Use it for documented T-cell lymphoma involving tissues outside lymph nodes, such as an organ or other non-nodal site.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include a mass, organ-specific symptoms, or biopsy-confirmed lymphoma in an extranodal site, with pathology supporting a peripheral T-cell lineage.
When to use this code
Use C84.49 when the provider documents peripheral T-cell lymphoma, not elsewhere classified, in an extranodal or solid organ location. It is appropriate when the record clearly identifies the site as outside lymph nodes and does not name a more specific lymphoma subtype.
If the pathology report or clinician note is vague, check documentation before coding. You should also confirm whether the lymphoma is primary at the extranodal site or part of more widespread disease, since site and type must match the record.
Do not use for
Do not use this code for nodal lymphoma, other specified T-cell lymphomas, or B-cell lymphomas. If the site or subtype is different, choose the more specific documented code.
Coding tip
Code only when both the peripheral T-cell type and the extranodal or solid organ site are clearly documented.