ICD-10 Code C86.1 – Hepatosplenic T-cell lymphoma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C86.1 – Hepatosplenic T-cell lymphoma
What it is
C86.1 identifies hepatosplenic T-cell lymphoma, a rare and aggressive lymphoma that involves the liver, spleen, and often the bone marrow. Use it when documentation names this specific T-cell lymphoma.
Clinical signs
Typical findings include hepatosplenomegaly, systemic symptoms, and cytopenias. Clinical features vary; refer to documentation for the confirmed diagnosis and disease extent.
When to use this code
Use C86.1 when the provider documents hepatosplenic T-cell lymphoma by name, or clearly confirms this subtype in pathology or oncology notes. It fits confirmed cases involving the hepatosplenic pattern, even when the chart also describes marrow or blood involvement. Check documentation if the wording is broader, such as unspecified T-cell lymphoma.
Do not use for
Do not use this code for other T-cell lymphomas, B-cell lymphomas, or nonspecific lymphoma terms without subtype confirmation. If the diagnosis is uncertain or not documented as hepatosplenic T-cell lymphoma, check documentation.
Coding tip
Code the exact lymphoma subtype only when the record supports it; otherwise, query for clarification before assigning C86.1.