Lead-induced chronic gout, left knee, without tophus (tophi)

This code signifies a chronic inflammatory arthritis affecting the left knee, specifically caused by elevated lead levels in the body. It indicates the absence of visible or palpable urate crystal deposits (tophi) in or around the joint. This condition results from the impaired excretion of uric acid due to lead toxicity, leading to crystal formation and subsequent inflammation.

Apply this code when documentation clearly states a diagnosis of chronic gout in the left knee, with a confirmed or strongly suspected etiology of lead poisoning. Supporting documentation should include evidence of elevated lead levels (e.g., blood lead tests) and clinical findings consistent with gout, such as joint pain, swelling, and tenderness in the left knee.

• Ensure documentation specifies "chronic" gout and explicitly links it to "lead-induced" etiology.
• Verify the affected joint is the "left knee"; laterality is crucial for accurate coding.
• Confirm the absence of "tophi" in the documentation; if present, a different code would be appropriate.