ICD-10 Code C85.99 – Non-Hodgkin lymphoma, unspecified, extranodal and solid organ sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C85.99 – Non-Hodgkin lymphoma, unspecified, extranodal and solid organ sites
What it is
This code identifies Non-Hodgkin lymphoma when the site is an extranodal or solid organ location, but the specific lymphoma type is not documented. Use it only when the record supports lymphoma outside lymph nodes and no more specific code is available.
Clinical signs
Clinical features vary; refer to documentation. Extranodal disease may present with a mass, organ dysfunction, pain, or imaging findings in a solid organ, but the chart must confirm lymphoma involvement and site.
When to use this code
Use C85.99 when the provider documents Non-Hodgkin lymphoma involving an extranodal or solid organ site and does not name a more specific histology or site code. It also fits cases where the pathology or note confirms lymphoma in a solid organ, but details remain nonspecific. Check documentation if the primary site, histologic subtype, or nodal involvement is unclear.
Do not use for
Do not use this code for lymphomas with a documented specific subtype or for nodal disease only. If the record names another exact site or diagnosis, choose the more specific code.
Coding tip
Code the most specific lymphoma site and subtype documented; if either is missing, verify the pathology or provider note before assigning C85.99.