ICD-10 Code C83.98 – Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of multiple sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.98 – Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of multiple sites
What it is
This code identifies a non-follicular, diffuse lymphoma that is not further specified and involves lymph nodes in multiple sites. Use it when the record confirms this lymphoma type but does not name a more specific subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lymphoma include enlarged lymph nodes, systemic “B” symptoms, or other signs of nodal disease, but you should code only what is documented.
When to use this code
Use C83.98 when the provider documents non-follicular or diffuse lymphoma and specifies multiple lymph node sites, but does not identify a more exact histology or anatomic detail. It also fits cases where the diagnosis is confirmed yet remains unspecified in the chart. Check documentation if the record names a different lymphoma subtype or a single nodal region.
Do not use for
Do not use this code for follicular lymphoma, Hodgkin lymphoma, or a lymphoma with a more specific documented subtype. If the site or histology is better defined, choose the more precise code.
Coding tip
Code from the most specific pathology or oncology documentation available, and query the provider if “unspecified” is the only wording.