Chronic lymphadenitis, except mesenteric

This code signifies persistent inflammation and enlargement of one or more lymph nodes, excluding those located in the mesentery. It indicates a long-standing inflammatory process within the lymphatic system, often in response to chronic infection or other inflammatory conditions.

Use this code when documentation specifies chronic lymphadenitis in any anatomical location other than the mesentery. This typically applies when a patient presents with palpable, tender, or non-tender enlarged lymph nodes that have persisted for an extended period, and acute causes have been ruled out.

• Differentiate from acute lymphadenitis (L04.-) based on documented duration and clinical presentation.
• Ensure the documentation explicitly excludes mesenteric involvement; otherwise, consider K67.1 for mesenteric lymphadenitis.
• Code any underlying cause of the chronic lymphadenitis, if known, as a secondary diagnosis.