Idiopathic chronic gout, right ankle and foot, with tophus

This code signifies a chronic, primary form of gout affecting the right ankle and foot, characterized by the presence of tophi. Tophi are deposits of monosodium urate crystals that form visible lumps under the skin or in other tissues, indicating advanced or poorly controlled gout.

Apply this code when documentation clearly states idiopathic chronic gout involving the right ankle and foot, specifically noting the presence of tophaceous deposits. This is appropriate for patients with a long-standing history of hyperuricemia and recurrent gout attacks, now presenting with these characteristic crystal accumulations.

• Ensure documentation specifies "idiopathic" or "primary" chronic gout to differentiate from secondary forms.
• Verify the laterality (right) and specific anatomical site (ankle and foot) are clearly documented.
• Confirm the presence of "tophus" or "tophi" is explicitly stated, as this significantly impacts code selection.