ICD-10 Code C82.1 – Follicular lymphoma grade II (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.1 – Follicular lymphoma grade II
What it is
C82.1 identifies follicular lymphoma, grade II, a type of non-Hodgkin lymphoma made up of medium-sized B-cell follicles. Use it when documentation specifies grade II disease rather than another follicular lymphoma grade.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include painless lymph node enlargement, fatigue, and other lymphoma-related symptoms, but the diagnosis and grade should be confirmed in the pathology report.
When to use this code
Use C82.1 when the provider documents follicular lymphoma grade II or an equivalent pathology diagnosis. It may also apply when the record clearly states grade II follicular lymphoma without conflicting grading information. If the grade is unclear, check documentation before coding.
Do not use for
Do not use this code for follicular lymphoma of another grade, mixed or transformed lymphoma, or unspecified follicular lymphoma. If the record only says “follicular lymphoma” without a grade, choose the unspecified code instead.
Coding tip
Always code the documented histologic grade exactly as stated in the pathology or oncology note.