ICD-10 Code C81.99 – Hodgkin lymphoma, unspecified, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C81.99 – Hodgkin lymphoma, unspecified, extranodal and solid organ sites
What it is
C81.99 identifies Hodgkin lymphoma when the site is extranodal or in a solid organ, but the specific organ is not documented. Use this code when the record confirms Hodgkin lymphoma and a non-nodal location.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include enlarged lymph nodes, unexplained weight loss, fever, night sweats, or symptoms related to the involved extranodal or solid organ site.
When to use this code
Use this code when the provider documents Hodgkin lymphoma affecting an extranodal site or solid organ and does not name the exact site. It also fits when the chart states “unspecified” location within those sites. If the specific organ is later identified, code the documented site instead.
Do not use for
Do not use C81.99 for nodal Hodgkin lymphoma or for a specifically documented extranodal or solid organ site. Check documentation if the record only says “Hodgkin lymphoma” without site detail.
Coding tip
Query for the exact involved site whenever possible, because unspecified location can affect code selection and reporting accuracy.