Chronic gout due to renal impairment, left knee, with tophus

This code signifies a persistent form of gout affecting the left knee, specifically caused by compromised kidney function. The presence of tophi, which are deposits of uric acid crystals, further characterizes this chronic condition. This indicates a long-standing inflammatory arthritis with visible manifestations of urate accumulation.

Apply this code when documentation clearly states chronic gout in the left knee, explicitly linking its etiology to renal impairment. The medical record must also confirm the presence of tophi in or around the left knee joint. This code is appropriate for patients with a confirmed diagnosis of chronic gout secondary to kidney disease, presenting with palpable or imaging-confirmed tophaceous deposits.

• Ensure documentation specifies "chronic" gout and explicitly links it to "renal impairment" as the cause.
• Verify the laterality is "left knee" and that "tophus" or "tophi" are documented.
• Do not use this code for acute gout, gout due to other causes, or gout without tophi, even if renal impairment is present.