Other secondary chronic gout, left knee, without tophus

This code signifies chronic gout that has developed as a consequence of another underlying condition, specifically affecting the left knee. It indicates the absence of tophi, which are deposits of uric acid crystals that can form under the skin or in joints. This is a persistent form of gout, rather than an acute flare.

Use this code when documentation clearly states "secondary chronic gout" involving the left knee, and explicitly notes the absence of tophi. This code is appropriate for patients with ongoing, long-term gout in the left knee that is attributable to another medical condition or medication. The physician's notes should specify the secondary nature of the gout.

• Ensure documentation specifies "secondary" gout and the laterality as "left knee."
• Do not use this code if tophi are present; a different code from the M1A.462 series would be appropriate.
• Always code the underlying condition causing the secondary gout first, if known and documented.