Lead-induced chronic gout, left ankle and foot, with tophus

This code signifies a chronic inflammatory arthritis affecting the left ankle and foot, specifically caused by lead exposure. The presence of tophi, which are deposits of uric acid crystals, indicates advanced disease. This condition results from impaired uric acid excretion due to lead toxicity.

Apply this code when documentation clearly states chronic gout in the left ankle and foot, explicitly attributed to lead poisoning, and notes the presence of tophaceous deposits. This diagnosis requires a confirmed history of lead exposure and clinical findings consistent with gout.

• Ensure documentation specifies "chronic" gout and explicitly links it to "lead-induced" etiology.
• Verify the affected anatomical site is precisely the "left ankle and foot."
• Confirm the presence of "tophus" or "tophi" in the medical record to support this specific subclassification.