Oth secondary chronic gout, unsp ankle and foot, with tophus

This code signifies a chronic form of gout that is secondary to another underlying condition, affecting an unspecified ankle or foot, and characterized by the presence of tophi. Tophi are deposits of uric acid crystals that form visible lumps under the skin, indicating advanced or poorly controlled gout.

Use this code when documentation clearly indicates chronic gout that is secondary, involves an unspecified ankle or foot, and specifically mentions the presence of tophi. This code is appropriate when the specific ankle or foot (e.g., right, left, bilateral) is not documented.

• Ensure documentation specifies "secondary" gout; otherwise, consider primary gout codes.
• Verify the presence of tophi; if absent, a different code for chronic gout without tophi should be selected.
• Only use this code when the laterality of the affected ankle/foot is truly unspecified in the medical record.