Direct infct of unsp knee in infec/parastc dis classd elswhr

This code signifies an inflammatory arthritis of the knee joint caused by an infectious agent, where the underlying infectious or parasitic disease is classified elsewhere in the ICD-10-CM system. It indicates a direct invasion of the knee joint by pathogens, leading to synovitis and joint destruction.

Apply this code when documentation specifies an infectious arthritis of an unspecified knee, and the primary infectious disease (e.g., tuberculosis, Lyme disease, syphilis) is also documented and coded separately. This code is appropriate when the infection directly affects the joint, rather than being a reactive arthritis.

• Always sequence the underlying infectious or parasitic disease code first, followed by this code.
• Ensure documentation clearly states "direct infection" or "infectious arthritis" of the knee.
• Avoid using this code for reactive arthritis or post-infectious arthritis, which have different code assignments.