ICD-10 Code C82.18 – Follicular lymphoma grade II, lymph nodes of multiple sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.18 – Follicular lymphoma grade II, lymph nodes of multiple sites
What it is
C82.18 identifies follicular lymphoma, grade II, involving lymph nodes at multiple sites. Use it when the record specifies this subtype and distribution of disease.
Clinical signs
Typical findings include painless enlarged lymph nodes, often in more than one region. Clinical features vary; refer to documentation for grade, site involvement, and pathology confirmation.
When to use this code
Use this code when the provider documents grade II follicular lymphoma and states that multiple lymph node sites are affected. It is appropriate for confirmed diagnoses in outpatient, inpatient, and oncology records. Check documentation if the grade or nodal distribution is unclear.
Do not use for
Do not use it for other follicular lymphoma grades, single-site nodal disease, or unspecified lymphoma type. If the note does not clearly support grade II with multiple sites, check documentation.
Coding tip
Confirm both the histologic grade and the number of nodal sites before assigning C82.18.