Other secondary chronic gout, right knee, with tophus

This code signifies chronic gout that has developed as a secondary condition, affecting the right knee, and is characterized by the presence of tophi. Tophi are deposits of monosodium urate crystals that form visible lumps, indicating advanced or poorly controlled chronic gout. The "other secondary" designation implies that the gout is a consequence of another underlying medical condition or medication.

Use this code when documentation clearly states chronic gout of the right knee with tophaceous deposits, and specifies that the gout is secondary to another condition (e.g., renal failure, diuretic use, lead poisoning). The physician's notes should explicitly mention "tophus" or "tophi" and the laterality of the affected knee.

• Ensure documentation differentiates between primary and secondary gout; this code is specifically for secondary chronic gout.
• Verify the presence of tophi; if tophi are not documented, a different code for chronic gout without tophi would be appropriate.
• Always sequence the underlying condition causing the secondary gout first, if known and applicable.