Idiopathic chronic gout, vertebrae, with tophus (tophi)

This code signifies a diagnosis of chronic gout where the underlying cause is unknown (idiopathic), specifically affecting the vertebrae, and characterized by the presence of tophi. Tophi are deposits of uric acid crystals that form visible lumps, indicating advanced or poorly controlled gout.

Apply this code when documentation confirms idiopathic chronic gout with vertebral involvement and the presence of tophaceous deposits. This typically occurs in patients with a long history of gout, often with elevated serum uric acid levels and imaging evidence of vertebral tophi.

• Ensure documentation explicitly states "idiopathic" and "vertebrae" with "tophi."
• Do not use this code for acute gout flares or gout without tophi.
• Consider additional codes for specific vertebral locations if documented (e.g., cervical, thoracic, lumbar).