Hyperplasia of appendix (lymphoid)

This code describes an abnormal increase in the number of normal cells within the appendix, specifically referring to lymphoid tissue hyperplasia. It indicates a non-neoplastic enlargement of the appendix's lymphoid follicles, often a reactive process rather than a primary disease.

Use this code when documentation explicitly states "hyperplasia of appendix" or "lymphoid hyperplasia of appendix." This diagnosis is typically made histopathologically after an appendectomy, often in cases where appendicitis was suspected but not confirmed.

• Do not use this code for inflammatory conditions of the appendix, such as acute or chronic appendicitis.
• Ensure the pathology report specifically identifies hyperplasia and not another appendiceal condition.
• This code is often a secondary diagnosis when an appendectomy was performed for suspected appendicitis (e.g., K35.80 for acute appendicitis, unspecified).