ICD-10 Code C83.16 – Mantle cell lymphoma, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.16 – Mantle cell lymphoma, intrapelvic lymph nodes
What it is
C83.16 identifies mantle cell lymphoma involving the intrapelvic lymph nodes. Use it when the record specifies this lymphoma subtype and the pelvic nodal site.
Clinical signs
Clinical features vary; refer to documentation. Mantle cell lymphoma may present with enlarged lymph nodes, constitutional symptoms, or other signs of lymphoid malignancy.
When to use this code
Use this code when the provider documents mantle cell lymphoma in intrapelvic lymph nodes, including confirmed primary or involved pelvic nodal disease. Code it from pathology, oncology, or discharge documentation that clearly names both the subtype and site.
If the note only says mantle cell lymphoma without a nodal location, check documentation before assigning this code. You should not infer pelvic involvement from generalized lymphoma wording alone.
Do not use for
Do not use C83.16 for unspecified mantle cell lymphoma, other lymphoma subtypes, or lymphoma in nonpelvic lymph nodes. Check documentation if the anatomic site is unclear.
Coding tip
Verify both the histology and the intrapelvic nodal site in the same source note before coding.