Drug-induced gout, left ankle and foot

This code signifies an inflammatory arthropathy characterized by the deposition of uric acid crystals in the left ankle and foot joints, specifically induced by a medication. It represents a secondary form of gout where drug therapy is the precipitating factor for hyperuricemia and subsequent crystal formation.

Apply this code when documentation clearly states a diagnosis of gout affecting the left ankle and foot, and explicitly links the onset or exacerbation of the gout to a specific drug. This typically occurs in patients taking diuretics, aspirin (low dose), cyclosporine, or certain antituberculosis drugs. Documentation should specify the drug causing the reaction.

• Always identify the specific drug causing the gout using an external cause code (T36-T50 series) in conjunction with this diagnosis.
• Ensure the laterality (left ankle and foot) is clearly documented; do not use this code for bilateral or unspecified sites.
• Distinguish from primary gout (M10.0-) or gout due to renal impairment (M10.3-); the key is drug causation.