ICD-10 Code C83.94 – Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of axilla and upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.94 – Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of axilla and upper limb
What it is
This code identifies a non-follicular, or diffuse, lymphoma of unspecified type involving lymph nodes in the axilla or upper limb. Use it when the record names this nodal site but does not specify the exact lymphoma subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include enlarged axillary or upper-limb lymph nodes, with diagnosis supported by pathology, imaging, or specialist assessment.
When to use this code
Use C83.94 when the provider documents non-follicular (diffuse) lymphoma affecting lymph nodes of the axilla or upper limb and does not name a more specific type. It is also appropriate when the site is clear but the subtype remains unspecified. Check documentation if later notes provide a more exact diagnosis.
Do not use for
Do not use this code for follicular lymphoma, other specified lymphoma subtypes, or lymphoma at a different lymph node site. If the chart identifies a more specific diagnosis, code that condition instead.
Coding tip
Verify both the lymphoma type and the anatomic site in the same note before assigning C83.94.