ICD-10 Code C85.17 – Unspecified B-cell lymphoma, spleen (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.17 – Unspecified B-cell lymphoma, spleen
What it is
C85.17 identifies a B-cell lymphoma involving the spleen when the subtype is not further specified. Use it when the record confirms splenic involvement but does not name a more precise lymphoma type.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see splenic enlargement, abdominal fullness, or findings of lymphoma on imaging or pathology, but the exact presentation depends on the underlying disease.
When to use this code
Use this code when the provider documents unspecified B-cell lymphoma with splenic involvement and no more specific histology is available. It also fits cases where the spleen is the named site and the lymphoma subtype remains unclear. Check documentation if another lymphoma code is more specific.
Do not use for
Do not use C85.17 when the lymphoma type is specified elsewhere, such as a more exact B-cell lymphoma diagnosis. Do not assign it for benign splenic enlargement or for lymphoma without documented spleen involvement.
Coding tip
Verify both the lymphoma subtype and the spleen site in the report before coding.