ICD-10 Code C82.22 – Follicular lymphoma grade III, unspecified, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.22 – Follicular lymphoma grade III, unspecified, intrathoracic lymph nodes
What it is
This code identifies follicular lymphoma, grade III, involving intrathoracic lymph nodes when the specific node site is not further defined. Use it for a documented malignant lymphoma diagnosis affecting chest lymph nodes.
Clinical signs
Clinical features vary; refer to documentation. Common findings in follicular lymphoma include enlarged lymph nodes, often painless, and evidence of nodal disease on imaging or biopsy confirming grade III histology.
When to use this code
Use C82.22 when the provider documents grade III follicular lymphoma and specifies intrathoracic lymph node involvement, but does not name a more exact thoracic nodal site. It also fits when pathology and imaging support this site assignment. Check documentation if the record instead identifies another lymph node region.
Do not use for
Do not use this code for follicular lymphoma in other nodal regions, extranodal sites, or when the grade is not documented as III. If the site or grade is unclear, check documentation.
Coding tip
Confirm both the grade and the intrathoracic nodal site in the pathology or oncology note before assigning C82.22.