Radial collateral ligament sprain

This code signifies a sprain or tear of the radial collateral ligament (RCL) of the wrist. The RCL is a fibrous band on the thumb side of the wrist, connecting the radius to the scaphoid and trapezium bones, providing stability to the radiocarpal joint.

Use this code for injuries resulting from forced adduction or hyperextension of the wrist, often seen in falls onto an outstretched hand or sports-related trauma. Documentation should clearly indicate a sprain or partial tear of the radial collateral ligament, often supported by physical examination findings (e.g., localized pain, swelling, tenderness over the RCL) and imaging results if performed.

• Differentiate from ulnar collateral ligament sprains (842.00-842.09) which involve the opposite side of the wrist.
• Ensure the documentation specifies "sprain" or "tear" and not a fracture or dislocation, which would require different codes.
• Consider an external cause code (E-code) to describe the circumstances of the injury.