ICD-10 Code C82.00 – Follicular lymphoma grade I, unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.00 – Follicular lymphoma grade I, unspecified site
What it is
C82.00 identifies follicular lymphoma, grade I, when the primary site is not specified in the record. It is a low-grade B-cell non-Hodgkin lymphoma, so you should code the documented diagnosis exactly as stated.
Clinical signs
Clinical features vary; refer to documentation. Common findings in follicular lymphoma include enlarged lymph nodes, sometimes painless, and disease that may be found on imaging or biopsy rather than symptoms alone.
When to use this code
Use C82.00 when the provider documents follicular lymphoma, grade I, and does not identify a specific anatomic site. This code fits initial or ongoing encounters when the diagnosis is confirmed and site detail is absent. If the site is later documented, choose the more specific code.
Do not use for
Do not use this code if the record states a different follicular lymphoma grade or a specific site. Check documentation when the diagnosis is unclear, because unspecified site is not a substitute for missing confirmation.
Coding tip
Code the lymphoma grade and site exactly as documented; if site is missing, use the unspecified-site code only after confirming the diagnosis.