Chronic gout due to renal impairment, right knee, w tophus

This code signifies chronic gout that has developed as a consequence of impaired kidney function, specifically affecting the right knee. The presence of tophi, which are deposits of uric acid crystals, further characterizes this chronic condition.

Apply this code when documentation clearly indicates chronic gout in the right knee, explicitly stating its etiology as renal impairment. The medical record must also confirm the presence of tophaceous deposits in the affected joint.

• Ensure documentation specifies "chronic" gout and links it directly to renal impairment.
• Verify the laterality (right knee) and the presence of tophi are clearly stated.
• Always sequence the underlying renal disease code before this gout code.