Chronic gout due to renal impairment, multiple sites, w toph

This code signifies a chronic form of gout that has developed as a direct consequence of impaired kidney function. The gout affects multiple joints throughout the body and is characterized by the presence of tophi, which are deposits of uric acid crystals in soft tissues.

Apply this code when documentation clearly links chronic gout to underlying renal impairment, specifies involvement of more than one joint, and notes the presence of tophaceous deposits. This diagnosis is typically supported by laboratory findings of elevated uric acid, imaging studies showing tophi, and evidence of chronic kidney disease.

• Ensure documentation explicitly states "due to renal impairment" to differentiate from other etiologies of chronic gout.
• Verify that "multiple sites" and "with tophus (tophi)" are clearly documented to support the specificity of this code.
• Sequence this code after the underlying chronic kidney disease (CKD) code, as the gout is a manifestation of the renal impairment.