Other secondary chronic gout, unspecified knee, with tophus

This code signifies a chronic form of gout that has developed as a consequence of another underlying condition, affecting an unspecified knee joint. The presence of tophi, which are deposits of uric acid crystals, further characterizes this specific manifestation of the disease. This indicates advanced or long-standing gout.

Apply this code when documentation clearly indicates secondary chronic gout impacting an unspecified knee, and specifically mentions the presence of tophaceous deposits. This is appropriate when the laterality of the affected knee is not specified in the medical record. Ensure the physician explicitly links the gout to another underlying medical condition.

• Do not use this code if the gout is primary or if the laterality of the knee is specified (e.g., right or left).
• Always sequence the underlying condition causing the secondary gout first, if known and documented.
• Confirm documentation specifies "chronic" gout and the presence of "tophus" or "tophi" to support this specific code.