ICD-10 Code C81.90 – Hodgkin lymphoma, unspecified, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C81.90 – Hodgkin lymphoma, unspecified, unspecified site
What it is
This code identifies Hodgkin lymphoma when the record confirms the disease but does not specify subtype or involved site. Use it when documentation supports Hodgkin lymphoma, yet details are incomplete.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include painless lymph node enlargement, systemic “B” symptoms, or biopsy-confirmed Hodgkin lymphoma.
When to use this code
Use C81.90 when the provider documents Hodgkin lymphoma without naming a subtype or anatomic site. It is appropriate for confirmed cases with limited detail in the chart. If later notes specify the subtype or site, code to the more exact diagnosis.
Do not use for
Do not use this code for non-Hodgkin lymphoma or for Hodgkin lymphoma with a documented subtype or site that can be coded more specifically. Check documentation.
Coding tip
Query the provider when the lymphoma type or site is missing, because unspecified codes should be reserved for truly incomplete documentation.