Follicular lymphoma grade III, unsp, intra-abd lymph nodes

This code signifies a high-grade follicular lymphoma, specifically grade III, affecting lymph nodes located within the abdominal cavity. Follicular lymphoma is a type of non-Hodgkin lymphoma originating from B-lymphocytes, and grade III indicates a more aggressive cellular morphology. The "unspecified" aspect refers to the absence of further subclassification (e.g., with or without diffuse large B-cell component).

Apply this code when documentation clearly states a diagnosis of follicular lymphoma, grade III, and specifies involvement of intra-abdominal lymph nodes. This is typically supported by pathology reports from biopsy or surgical excision, along with imaging studies confirming the location. Use when the specific subclassification of grade III follicular lymphoma is not documented.

• Ensure the pathology report explicitly states "grade III" for follicular lymphoma; do not assume based on other findings.
• Verify the anatomical location is "intra-abdominal lymph nodes" to differentiate from other nodal sites.
• Do not use if the documentation specifies follicular lymphoma grade III with a diffuse large B-cell component, as a more specific code would apply.