ICD-10 Code C82.43 – Follicular lymphoma grade IIIb, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.43 – Follicular lymphoma grade IIIb, intra-abdominal lymph nodes
What it is
This code identifies follicular lymphoma grade IIIb involving intra-abdominal lymph nodes. Use it for a documented high-grade follicular lymphoma subtype located in abdominal nodal sites.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include enlarged abdominal lymph nodes, abdominal discomfort, or imaging evidence of nodal disease, with diagnosis confirmed by pathology.
When to use this code
Use C82.43 when the record specifically states follicular lymphoma grade IIIb and identifies intra-abdominal lymph nodes as the site. You may use it from pathology, oncology, or discharge documentation if the diagnosis is clearly established.
If the site is only described as abdominal or retroperitoneal without further detail, check documentation before coding. Confirm that the grade and nodal location are both documented.
Do not use for
Do not use this code for other follicular lymphoma grades, unspecified lymphoma, or non-nodal abdominal tumors. Check documentation if the site is extranodal or the grade is not stated.
Coding tip
Code the exact grade and lymph node location together; if either element is missing, query the provider.