Chronic instability of knee, right knee

This code signifies persistent laxity or giving way of the right knee joint, often due to ligamentous insufficiency or prior injury. It indicates a long-standing issue affecting the stability of the knee, leading to recurrent subluxations or feelings of insecurity.

Apply this code when documentation explicitly states chronic instability of the right knee. This typically arises from conditions like chronic anterior cruciate ligament (ACL) deficiency, posterior cruciate ligament (PCL) insufficiency, or multi-ligamentous laxity. Supporting documentation should include a history of recurrent knee "giving out" or subjective instability, and objective findings such as positive Lachman, pivot shift, or posterior drawer tests.

• Ensure the documentation specifies "chronic" instability; acute instability uses different codes.
• Laterality is crucial; verify "right knee" is clearly documented.
• Look for underlying causes (e.g., old ligament tear) which may be coded additionally if still relevant and treated.