Idiopathic chronic gout, left ankle and foot, with tophus

This code signifies a chronic inflammatory arthritis caused by uric acid crystal deposition, specifically affecting the left ankle and foot, and characterized by the presence of tophi. Tophi are visible or palpable nodules of urate crystals that form in soft tissues. The "idiopathic" designation indicates that the underlying cause of the elevated uric acid is unknown.

Use this code for patients diagnosed with long-standing gout where the left ankle and/or foot are affected, and physical examination or imaging confirms the presence of tophaceous deposits. Documentation should clearly state "idiopathic chronic gout," specify the left ankle and foot involvement, and explicitly mention "with tophus" or "tophaceous gout."

• Ensure documentation specifies "idiopathic" and "chronic" to differentiate from acute or secondary gout.
• Laterality is crucial; confirm left ankle and foot involvement.
• Always verify the presence of tophi; if absent, a different subcategory of M1A.07 would be appropriate.