Flail joint, right knee

This code describes a flail joint affecting the right knee, indicating an abnormal, excessive, and uncontrolled range of motion due to severe ligamentous instability or neuromuscular dysfunction. This condition often results in significant functional impairment and instability of the knee joint.

Use this code when documentation clearly states "flail joint" specifically impacting the right knee. This diagnosis is typically supported by physical examination findings demonstrating gross instability and lack of structural integrity, often following severe trauma, multiple ligament tears, or neurological deficits.

• Ensure the documentation specifies "flail joint" and not just general instability or hypermobility.
• Verify laterality (right knee) is explicitly stated; do not assume.
• Consider sequencing this code with an underlying cause (e.g., severe ligamentous injury, neurological condition) if documented.